Exhaust

[C10 the GEM]

Do car motors need backpressure? (305, 350)

[swb85]

Absolutely not.....anyone who tells you otherwise is just spreading myths. You need exhaust velocity, not backpressure. You want to keep the exhaust hot and moving quickly for the best power. Too large of a pipe will allow the exhaust to cool and slow down which hurts torque production, too small of a pipe will create a flow restriction.

[jchav62]

So you need a little back pressure for torque?

[Longhorn321]

I agree with SWB85 that you need velocity for better torque. More volume gives you more power so you have to find a balance between torque and power with the correct size pipe. The only thing you might consider backpressure for is for the tone of the exhaust.

[swb85]

Originally Posted by jchav62

So you need a little back pressure for torque?

No! You want a correctly sized, lowest possible restriction exhaust system for torque. Backpressure = NEVER EVER EVER WANTED.

[SRH916]

What is a good size you would reccomend for a bone stock 350?

[Pyrotechnic]

Dual 2.25 pipes with a crossover pipe.

[swb85]

Originally Posted by Pyrotechnic

Dual 2.25 pipes with a crossover pipe.

[SRH916]

is it possible to fit a x or an h pipe and still dump before the axle infront of the rear tires?

[C10 the GEM]

would 3" exhaust be to big?

[PhilaTruck]

Originally Posted by SRH916

is it possible to fit a x or an h pipe and still dump before the axle infront of the rear tires?

You mean with mufflers, maybe cats & tranny crossmember?

Take a look at this- it gives you a pretty good idea.

73-87chevytrucks.com

C10: A stock engine doesn't need a 3" dual exhaust.

Back pressure? I think people confuse this with negative pressure waves, AKA scavenging.

[SRH916]

no cats needed