Flowmaster

I'm trading my stock exhaust for a FlowMaster, is this a good thing to do and is flowmaster a good replacement.





2001 Chevrolet Blazer 4.3

they sound good but don't flow very well.

well is it better than my stock POS with dent in it?

http://www.automotiveforums.com/vbulletin/showthread.php?t=571572

look at that, my 40 series flow master w/ side exit soudns awesome i think. If i find a ravin i may to the switch though

well is it better than my stock POS with dent in it?

flowmaster's a noticeable sound/performance upgrade over stock (assuming cat-back) but there are better performance set ups out there.

Go with a cherry Bomb Vortex.

They bought out Ravin's design and are practically the same thing.

Don't go with flowmaster, it won't do anything but drone.

The only things that flowmasters actually live up to is their sound. Especially on f bodies, they flow less then stock.

Go with a cherry Bomb Vortex.

They bought out Ravin's design and are practically the same thing.

Don't go with flowmaster, it won't do anything but drone.

But the Cherry bomb Vortex Classic. or V-Baffle???

V baffle - the FloPro, Ravin and some Flowmasters use the semi-triangular velocity baffle inside the body tube of the muffler to make it's dstinctive tone.

Nice. I need to do an exhaust soon.

cherry bombs flow good but kill ur gas mileage

cherry bombs flow good but kill ur gas mileage

how does a better flowing muffler hurt your mpg? doen't decrease in back pressure = increase in mpg?

Decrease in backpressure too much on a 4.3 GM V-6 makes it operate a little wierd. It likes to have just the right amount still in order for proper EGR flow, O2 sensor feedback and allow the valve overlap from exhaust -> intake "stall" just a bit to help cool the exhaust valves from the natural scavenging that occurs with the draw created when the exhaust pulse streams down and through the collectors. Mess with this fine balance a little too much and the ECU doesn't know what to think on top of the *possibility* that you start damaging heads and exhaust valves with elevated temperatures. Further modification with headers/collectors usually means swapping all of that with new heads and valves that are hardened for the task. An ECM flash is also required to compensate for the new flow parameters and interpret fuel injection signals from MAP/MAF & O2 sensors. This is not to say it will not work, but I am one to err on the side of caution a little and upgrade *everything* in the path that is affected in this manner.

A FloPro is the most free flowing of them all, however, in our application the most I would venture to put on the truck would be a 750 with center inlet, offset outlet. (2.25" dimater tubes) This is bbout as close as you can get to the absolute edge without harming anything else; flow better than stock and save some dough while doing it. It maintains a token amount of backpressure so heads/valves stay cool, EGR does it's trick, O2 is metered properly and the ECU stays happy without tossing codes. And that's my :2cents:. :D I got an immediate 11% gain in MPG with my muffler setup before I opened up and modded the intake to match it.

Decrease in backpressure too much on a 4.3 GM V-6 makes it operate a little wierd. It likes to have just the right amount still in order for proper EGR flow, O2 sensor feedback and allow the valve overlap from exhaust -> intake "stall" just a bit to help cool the exhaust valves from the natural scavenging that occurs with the draw created when the exhaust pulse streams down and through the collectors. Mess with this fine balance a little too much and the ECU doesn't know what to think on top of the *possibility* that you start damaging heads and exhaust valves with elevated temperatures. Further modification with headers/collectors usually means swapping all of that with new heads and valves that are hardened for the task. An ECM flash is also required to compensate for the new flow parameters and interpret fuel injection signals from MAP/MAF & O2 sensors. This is not to say it will not work, but I am one to err on the side of caution a little and upgrade *everything* in the path that is affected in this manner.

A FloPro is the most free flowing of them all, however, in our application the most I would venture to put on the truck would be a 750 with center inlet, offset outlet. (2.25" dimater tubes) This is bbout as close as you can get to the absolute edge without harming anything else; flow better than stock and save some dough while doing it. It maintains a token amount of backpressure so heads/valves stay cool, EGR does it's trick, O2 is metered properly and the ECU stays happy without tossing codes. And that's my :2cents:. :D I got an immediate 11% gain in MPG with my muffler setup before I opened up and modded the intake to match it.

ah gotcha,, yea I dont really kno much about the 4.3 v6's

It's cool man, it's what we're all here for - to lean. :D It's all about exhaust velocities and the effect they have on head flow. If you let all of that energy pass without restriction, intake air/fuel mixture will not "dwell" or linger around and through the exhaust ports long enough for effective surface -> air heat transfer. That's the big killer. Everything else is curable with a proper ECM flash or Memcal update in the older rigs, like mine.

EDIT: Gotta remember, these left the factory as reliable, rock steady truck engines that run happily on regular pump gas. They generate great torque at sedate engine speeds, and though pressed, not really meant for continuous high speed operation. If you're going for a little more performance, the bolt on stuff works to a point. After you breech that point, time to think of complete engine mods, swapping stuff out of the bay or what some adventurous folks do - swap for the infamous small block V-8's and build them up to speed and power. :)

I turned a relatively tourqey, gas guzzling Ram 1500 into a decent street racer once, but it took all sorts of tricks in addition to just plain cat-back and intake mods to get it right. Dropped the dough to get matched flow injectors, beefier volume fuel pump, the performance DCM (and three different flashes until it ran right on pump premium fuel), cam, rear-end gearing, tranny toughening and enhanced cooling in to handle the increased engine output. Luckily, Dodge didn't make too much distinction between factory built engines and thier A-block crates making powerful, small block v-8 mods really easy. I was about to rebuild the entire bottom end of the crank and rods to really toughen things up some, but ended up selling off the truck for $7,500 more than I originally paid to cover a really rough spont in my life. I still miss that truck. *sniff* I'm content with my Blazer though, and try as I might - getting formidable power out of it is going to take considerable work and a few friend's favors that hve garages I can borow on weekends to get it all done right.

A FloPro is the most free flowing of them all, however, in our application the most I would venture to put on the truck would be a 750 with center inlet, offset outlet. (2.25" dimater tubes) This is bbout as close as you can get to the absolute edge without harming anything else; flow better than stock and save some dough while doing it. It maintains a token amount of backpressure so heads/valves stay cool, EGR does it's trick, O2 is metered properly and the ECU stays happy without tossing codes. And that's my :2cents:. :D I got an immediate 11% gain in MPG with my muffler setup before I opened up and modded the intake to match it.

Forgive my ignorance, but what is a "750," and where would it fall in flow rate compared to say the flowmasters and ravins? Is that the muffler setup you're running?

The number is just a model number indicating mostly inlet/outlet size, position of those pipes on the body cannister and relative flow rates. FloPro gives numbers to subsets of products with names. (I.E. FloPro Turbo 400, FloPro Twister 530, etc, etc. Mine is a straight, no nonsense oval FloPro 750 with an intererior, single baffle design that's seam welded)

Where it fits in as far as flow rates? 1st, really - followed by Ravin by a very close margin to be nearly identical, really - and then Flomaster at roughly 1/3 less flow rate. If you ever bought the complete FloPro kit in a box, there is a sheaf of paper with installation instructions and the flow charts based on a static water supply flowing through the muffler's innards vs other popular brands. Why they use liquid for testing instead of gas is a little of a mystery to me, but understood - as I use dynamic liquid simulation software to gage and design stuff that flow gasses. :D

you dont want free flow cause you loose all your low end torque

you dont want free flow cause you loose all your low end torque

true you do lose some low end torque, but what it does is shift the power curve of the engine to the right, and in the end you'll have more torque in the higher RPM's and it will net you quicker 1/8th and 1/4 times.

cherry bombs flow good but kill ur gas mileage

Dude, Cherry bombs are not all glass packs.

http://www.supremeperformance.com/DisplayTab.aspx?tid=2

Dude, Cherry bombs are not all glass packs.

http://www.supremeperformance.com/DisplayTab.aspx?tid=2
i always thought they were. thats how they are listed in jegs, summit, etc. if they aren't all the glass pack type, my bad.

i always thought they were. thats how they are listed in jegs, summit, etc. if they aren't all the glass pack type, my bad.

Sorry, my reply might have a sounded a little abrupt, it came across wrong.

They are all made by Maremont.

So you can just use a universal design right? What are the specs, inlet/outlet, center/offcenter?

So you can just use a universal design right? What are the specs, inlet/outlet, center/offcenter?

Well, they will have to weld an extension pipe on it.

2 1/4" offset inlet, center outlet I think.

Some of those Cherrybombs are reversible, changing the way exhaust rolls over the louvres inside the body tube. One way, it makes a rich, mellow tone and nice growl at launch. The other way around does the same thing, but when you let off the throttle, it doesn't dampen the random ignition of unburned fuel in the pipes, making a nifty pop-a-pop-popity-pop as you decel from highway speeds. :evillol:

I reversed a FloPro Turbo series muffler that was just a resonator can, similar to a glass pack on my Scooby with that 2.2 flat-4. Awesome sounding machine after all the go-fast parts went in, without a ricer fart pipe on the back end. It just sounded mean, and being all plain white, no pinstripes,stickers, nothing - quite a stealth sleeper. It scared folks when I would pull away from them @ WOT at lights, or playing in the sand/gravel where you have to snap the throttle for drift-like turning utilizing the built-in AWD.

ehh i went with the flow master any. The speed shop down he recomended it and i got it for 65 bucks with a lifetime warrenty. If it doesn't work out then i can just buy a new exhaust.

I think that I'm going to go with flowmaster, on my Blazer, too. I've already got them on my Impala.

I saw some tests a while back. If I remember correctly the Vortex flowed about 300 and had more horsepower. The flowmaster only flowed about 250, but had more low end torque.

I think that I'm going to go with flowmaster, on my Blazer, too. I've already got them on my Impala.

I saw some tests a while back. If I remember correctly the Vortex flowed about 300 and had more horsepower. The flowmaster only flowed about 250, but had more low end torque.

That is probably due to flow restriction and backpressure.

Nice i have one on my 95 Impala SS to :)

My flowmaster on my Blazer sets it apart from the rest. Get one.

I really dug the sound of a 2 Chamber Flowmaster on my 88 Mustang, But that was a v-8 allbeit not much bigger that my v-6 now. I also had the enitre cat-back on there, and I loved it.

Dude, Cherry bombs are not all glass packs.

http://www.supremeperformance.com/DisplayTab.aspx?tid=2

The original CherryBombs are glass packed, they always have been, take a look at the site that was referenced, it mentions this on their website.

I have the flowmaster cat back system on my camaro, along with the edelbrock headers upfront, it sounds good, flows good too. I am thinking of throwing a catback system on the '98, as the exhaust system on there is way too restrictive. I am thinking of a flowmaster muffler and I have a guy to bend some piping for the rest of the system.

The original CherryBombs are glass packed, they always have been, take a look at the site that was referenced, it mentions this on their website.

I have the flowmaster cat back system on my camaro, along with the edelbrock headers upfront, it sounds good, flows good too. I am thinking of throwing a catback system on the '98, as the exhaust system on there is way too restrictive. I am thinking of a flowmaster muffler and I have a guy to bend some piping for the rest of the system.

a 98 maro?

No, '89 IROC, its been in the family since it was new June 22, back in '89 the blazer i recently bought is the '98. The camaro has been sitting for about 4 years, just havn't had time for it, but now I am getting more eager to get it back on the street again, its such a fun car.

No, '89 IROC, its been in the family since it was new June 22, back in '89 the blazer i recently bought is the '98. The camaro has been sitting for about 4 years, just havn't had time for it, but now I am getting more eager to get it back on the street again, its such a fun car.
i know what u mean man. i miss my iroc. it had true duals and would set off car alarms left and right :evillol:

My System Sets Of Fire Alarms :)

it had true duals and would set off car alarms left and right :evillol:

and parking garages are especcially fun :evillol:

and parking garages are especcially fun :evillol:
those were the days :lol: . i don't, however, miss getting 7mpg.

Ok I got the 40 Delta Series Installed and it sounds excellent, Now is it Street Legal?

Ok I got the 40 Delta Series Installed and it sounds excellent, Now is it Street Legal?

Isn't the 40 series real loud? How is it inside the truck when your driving/accelerating? I am curious.

pretty loud but its not finished i have to run pipe from the outlet

Isn't the 40 series real loud? How is it inside the truck when your driving/accelerating? I am curious.

I had the 40 series (catback) on my grand am. it's pretty loud and sounds good, but it's nothing that'll turn the cops' heads. my friend's cammed 94 formula with open headers and a cutout might on the other hand attract some unwanted attention:)

mine sets off alarms right now cause theirs not pipe on the outlet i have to finish it right now. i will have pics later.

my friend has a 40 series on his 95 with a catco cat. it sounds good outside and is loud but there is noticeable interior resinance.

I was reading WOLFOX's reply and I had a question about the Flo-Pro muffler.
Is it the FP750 or the FP754 that you are recommending?
The FP750 is 2 inches in diameter and the FP754 is 2 1/4 inches in diameter. Both mufflers are offset inlet and center outlet but they are reversible according to Flo-Pro's website. I found both for around $60.00
at CompleteExhaust.com. I own a 1996 Blazer LS and was planning to change the muffler now that I have installed a new converter, and wanted to make sure that I'll buy the correct one for the truck. Thanks.