tubing size

[killerazonic]

i want to make exhaust for my 99 S10 4x4 4.3. I want to make it true dual through 2 flowmaster race mufflers then dumped before the rear passanger wheel. My question is will 2.5 be too big for a bone stock V6? or should i go with like 2.25?

[droopy89]

Thats a good idea, but personally i wouldnt go any more than 2.25 for true duals, because if the tubing is too big, theyre wont be enough backpressure

[Hammer Head]

Bone stock V6.. 2.25 will be plenty big on the street. Cheaper for the exhaust shop to do for you, too. You could even do 3" single exhaust.. cheaper still & the same power. All you need is the header pipe (goes from the manifolds to the cat) from an Astro w/ the 4.3. It's 2.25 into a single 3" outlet. Just some food for thought.

[Blazer69]

i have 2.5" on my 2 dr blazer single and it's great...still need to put a tip on it but i have a flowmaster 40 series muffler...good tone and rumble down effect

[Sparky2263]

It's not that you need 2.5", it just sounds better. I run it.

My opinion on back-pressure;

http://www.s10planet.com/forum/showthread.php?t=5579&highlight=back-pressure

[Hammer Head]

I like that response & thread.. you made me smile Sparky.

[Sparky2263]

Yeah, it's really a differential pressure equation. But that's too damn complicated for a 10th grade drop-out like me................

;)

[Hammer Head]

Too bad they haven't figured out how to teach common sense in schools yet... I think everything would work out a lot smoother if they could.

[Sparky2263]

Yeah, and now they try legislating common sense. Go figure............

[Hammer Head]

Yeah.. kinda goes along w/ that rich dad havin his kid start up that mustang in the other post.. maybe he learned a lesson in common sense..?

[T Man]

2.25 tubing, and throw an H pipe in there to equalize the pressure. Oughta pull pretty hard