Exhaust Cutout Yes or No?

[Submariner]

I posted this on the Sierra site with no responces so I was hoping somebody over here could answer my questions.

I was under the truck the other day and it occured to me I could modify the resonater to put in a cutout. The resonater on a flowmaster exhaust has room for another 3" pipe to come out of it. I figure I could cut a 3" hole, weld a 3" cutout pipe to the opening the add an electric cut out. That way when I'm crusing the highway I can bypass most of the exhaust and intown scare small children and old folks with the flip of a switch. Anybody ever try this? Will the lack of backpressure cause engine issues? Will it give me more power? Better milage? Or is it just a waste of money which will only produce more noise and get me noticed by the local cops?

[GMMerlin]

Anybody ever try this?

Yes..old school racing trick

Will the lack of backpressure cause engine issues?

No major issues

Will it give me more power?

No

Better milage?

Probaly not

Or is it just a waste of money which will only produce more noise and get me noticed by the local cops?

Most definately

[99redsilverado]

hey navyboy

i gotta see this 5.8 L motor you have

[Nigel215]

[Slowprocess]

Originally Posted by GMMerlin

Yes..old school racing trick


No major issues



No


Probaly not


Most definately

Actually, one of these responses is not true. A cutout will, in fact, give you more power than that crappy flowmaster. You will gain .1-.2 in the 1/4 guaranteed over flowing through that chokemaster.

[Submariner]

Originally Posted by 99redsilverado

hey navyboy

i gotta see this 5.8 L motor you have

Thats Mr. NAVY Boy to you Actually I must have been under the influence of something when I filled out my sig. All fixed now.

[Submariner]

Originally Posted by Slowprocess

Actually, one of these responses is not true. A cutout will, in fact, give you more power than that crappy flowmaster. You will gain .1-.2 in the 1/4 guaranteed over flowing through that chokemaster.

Is it my imagination or do you not like the flowmaster mufflers. I probably should have posted a question here prior to purchasing it or at least contacted you directly but instead I took the word of my local speed shop who sells and has installed pretty much all brands (I guess they are not as well informed as you). I will however say it is better than stock, Better than my buddies dual on his Avalanche (Not sure what it is but the one you have does ring a bell) and I have yet to hear or see one better but that being said I haven't seen or heard them all. Remember opinions are like A$$holes everyone has one and they all stink.

[jeverett]

I have a flowmaster and I hate it.

[Submariner]

Originally Posted by jeverett

I have a flowmaster and I hate it.

I see you have the 40 series. I have the 30. I wonder what the difference is. Mine has a nice deep growl at normal cruising and when I step on it it sounds like my old mopar with the 383 4bbl w/duals. Once I install the cutout it will be interesting to see how much difference there will be.

[airjam18]

I've got flowmasters in addition to having a cutout. I had my cutout open for about 3 months straight and its been closed ever since. I definitely gained power above 3500 rpm but it seemed to lag a little bit off the line. I didn't feel a serious gain, it was more like I lost a little low end and gained it up top. After driving it normally for some time I found that my mileage also went a bit south with it open. It may get you a tenth in the 1/4 but regardless its definitely worth it for sound. I also have yet to run it open with the 4.88 gears and the nelson tune.

BTW: I hate my flowmaster as well......shoulda gone magnaflow

[jeverett]

Originally Posted by Submariner

I see you have the 40 series. I have the 30. I wonder what the difference is. Mine has a nice deep growl at normal cruising and when I step on it it sounds like my old mopar with the 383 4bbl w/duals. Once I install the cutout it will be interesting to see how much difference there will be.

Mine is loud as hell mainly because I cut my cats last month. Now I hate interior resonance like hell. It kills my head. Thank God I have a nice system to drown it out.

[Submariner]

Originally Posted by airjam18

I've got flowmasters in addition to having a cutout. I had my cutout open for about 3 months straight and its been closed ever since. I definitely gained power above 3500 rpm but it seemed to lag a little bit off the line. I didn't feel a serious gain, it was more like I lost a little low end and gained it up top. After driving it normally for some time I found that my mileage also went a bit south with it open. It may get you a tenth in the 1/4 but regardless its definitely worth it for sound. I also have yet to run it open with the 4.88 gears and the nelson tune.

BTW: I hate my flowmaster as well......shoulda gone magnaflow

I guess it comes down to what your looking for. I wanted a low mean rumble at idle and normal cruise and an aggressive tone at acceleration. This set up gives it to me plus the added HP doesn't hurt. Either way I like it and am not sorry about my purchase. I've ridden in louder and didn't like the constant loud rumble in the cab.

With cut outs I was hoping to get more MPG's on the highway and something impressive off the line when some ford challenged me at the light I'll get it and run then open for awhile if I like it I'll invest in the electric cutout if not oh well I wasted 40 bucks or so.

[Submariner]

Originally Posted by jeverett

Mine is loud as hell mainly because I cut my cats last month. Now I hate interior resonance like hell. It kills my head. Thank God I have a nice system to drown it out.

Bummer. Mine is perfect It's loud and aggressive when I step on it and deep and mellow at idle or cruising. Should be interesting to see the diff with a cutout. I'll probably hate it but if thats the case at least I will be able to reverse it very easily.

[Slowprocess]

Originally Posted by Submariner

Is it my imagination or do you not like the flowmaster mufflers. I probably should have posted a question here prior to purchasing it or at least contacted you directly but instead I took the word of my local speed shop who sells and has installed pretty much all brands (I guess they are not as well informed as you). I will however say it is better than stock, Better than my buddies dual on his Avalanche (Not sure what it is but the one you have does ring a bell) and I have yet to hear or see one better but that being said I haven't seen or heard them all. Remember opinions are like A$$holes everyone has one and they all stink.

Being a smart ass will get you nowhere around here. You're looking for more power, yet you come on here and try to school me about how much your "local" speed shop knows about mufflers. I make these trucks go fast.....that's what I do. I know a flowmaster restricts exhaust flow on these trucks, thus reducing power. It doesn't take a rocket scientist to figure out a straight through muffler, such as a magnaflow, will outflow and outperform a flowmaster. Of course, I guess your "speedshop" guys would have already known that. Why don't you start telling me about performance on these trucks when you can get within 5 seconds of my 1/4 time. This site has no room for noobs like yourself coming on here and starting crap with someone that knows 100% more things about these trucks than you. Thanks for making my day.

[jeverett]

Hehehehe