Custom Exhausts

[thequin88]

Hey everyone, I am new to this forum. Well, as some teenagers have it these days, they get their passed down cars. Luckily enough, I got my mothers 1999 S-10 blazer. Pretty clean, car. Fun to mess around with (like racing around a neighborhood doing 65, almost rolling the blazer, while racing a buddy in his Jeep Cherokee) I have plans for this car though. I've gotten through the play around period and I am ready to work on it. I plan on putting a sound system in her. After that I plan on giving it a new exhaust system. I am currenty studying to be a Auto-mechanic, and I have the privledge of going into shop afterschool, with access to MIG/TIG, Oxy-Accyteline (sp?) welders, and metal benders, whatever I really need to work on my car. I know how to weld quite well. I was wondering, does anyone have good plans for a custom exhaust? I am really looking to for an exhaust plan that would bend the exhaust out behind the rear tires, like the new Silverado's. Also, a materials list would be greatly appreciated.
Thanks,

-TheQuin

[BlazerLT]

The piping and everything can stay put, just get a good single in / dual out and run dual tail pipes.

DO NOT put a dual exhaust on a 4.3L.

[thequin88]

Originally Posted by BlazerLT

The piping and everything can stay put, just get a good single in / dual out and run dual tail pipes.

DO NOT put a dual exhaust on a 4.3L.

May I ask why I should not put a dual exhaust on my 4.3?

[BlazerLT]

Because it is not needed and is a complete waste of money and time on a 4.3L.

You need a little backpressure for your engine.

You will actually see poorer performance with a dual on that engine.

[SComp23]

I just cut the muffler out, replaced it with pipe, and put a chrome tip on it, sounds badass, like a 5.7L Tahoe.

[thequin88]

Originally Posted by SComp23

I just cut the muffler out, replaced it with pipe, and put a chrome tip on it, sounds badass, like a 5.7L Tahoe.

Sweet thats pretty much what I meant by custom exhaust. I really meant custom pipe. That is my goal for this Blazer, LOUD.

[wolfox]

Agreed, BlazerLT. These engines will suffer greatly if there is no back-pressure at all. Dual exhaust is also dangerous to install, as it comes too close to brake and fuel lines on the driver's side. If it's a 4.3 CPI V-6 - sticking to the stock 2.25" pipes with the single outlet by the passenger side is best. When you bore of the noise and the tickets you start collecting because of noise infractions, bolt on a Ravin 55, FlowMaster 40, or even a FloPro 570 series with center inlet, offset outlet to maintain that rough rumble - but slightly tamed ride. Nothing like wide open exhaust to get troopers hand delivering little gifts to you every 10 miles on the freeway.

[BlazerLT]

Originally Posted by thequin88

Sweet thats pretty much what I meant by custom exhaust. I really meant custom pipe. That is my goal for this Blazer, LOUD.

Regative, replacing the piping will give you no results.

Keep the stock, slap on a Ravin Z33 and it will be loud.

[thequin88]

What size of a muffler would you guys recommend?

[BlazerLT]

What do you mean, the piping?

[SComp23]

Seriously don't put a muffler in, it cost me like 65 bucks to have my muffler cut out and have a piece of pipe put there, along with a chrome tip and it sounds better than any flowmaster.

[BlazerLT]

Originally Posted by SComp23

Seriously don't put a muffler in, it cost me like 65 bucks to have my muffler cut out and have a piece of pipe put there, along with a chrome tip and it sounds better than any flowmaster.

Poor advice, the engine needs proper exhaust flow resistance to run properly.

[SComp23]

My truck runs excellent

[wolfox]

Originally Posted by SComp23

My truck runs excellent

See you in a few K miles with busted out wrist bearings and scored/burned cylinders. Oh, and that little marble knocking you hear under your hood is not poor quality gas. It's your F*scked up "no back-pressure" exhaust solution tossing the computer for a loop.

*YOU NEED SOME* backpressure for the system to function normally. Long term divability problems may arise like - broken rods and fuzzy, white-fouled Oxygen sensors down the road. Use your head for something other than a hat-rack and do a little research on just how the GM CPI/TBI works in these trucks, and CSFI injection. Do the math and theory - then stand here and tell us how your truck runs "excellently" with a straight pipe. Tampering that badly with exhaust velocities also plays havoc with your valves and the seats in the heads. Hopefully you designed and built your engine around your exhaust "power" mod my friend...

My only clue as to how thoughtless you are is telling people how excellently your truck runs and sounds on a straight pipe. Nice, very nice. Please fill us all in on the other details on how you built the rest of the engine up to deal with running so out of spec; please, if you would be so kind?

I *detest* poor advice in a forum where a bad idea can become cannonical so easily...

(Lets BlazerLT take back the soapbox for now)

[SComp23]

The Catalytic Converter allows for enough backpressure. I really don't give two sh*ts what you read on the internet I asked several mechanics aout having this done before I finally had it taken out, now the engine breathes about 10 times better.