LMAO!!!!

That was not APA, or MLA format for citing was it? Good one Fries!

 

It is correct, what his tech guy said. Engines need a bit of backpressure or it will burn up the exhaust valves. So whle breathing is good you still need back pressure.

Typically I think the turbo will provide the needed back pressure.

If you are on a budget and already have parts you should be just fine running 2.5 into 2- 2.25's. I would not worry at all.

Now if it was me, I would likely do a single all the way back.

 

Wow thanks guys. This is alot of good sh!t. I ran into some issues with the patch harness not working for my ecu and then trying to get the cam sensors wired up for the fic. But the turbo finally goes in this weekend! and its straight to the exhaust shop immediately after for the good ole piping!!! lol

 

 

^ ????

 

^ I guess you dont lay the pipe often....

 

im still a little confused.

if i am going to be NA, will running 2.5" after the cat, into a y pipe then into 2.25 mufflers be bad?

 

No, you'll be fine. As long as the surface area after the split is the same or greater then before it.

If that makes sense...

 

thanks.

so i supposed going with what friesm2000, posted... 3" going into 2.25 would be slightly smaller than what is needed?

i suppose i should stay 2.5" if im going to be NA.

 

Yes, anything bigger than 2.5" you will actually lose power if your NA

unless you build your engine to 3.5 for example

 

so for 3.5's a 3" exhaust is recommended?

i tried searching this site for optimal exhaust setups by motor, but i cant really find anything.

 

You still want to have back pressure so to much flow on an engine that isn't big enough will cause you to lose power on the low end(I think)
Thats why trucks with big engines have big piping and race cars as well because they are only concerned about power higher up on the rpm band

 

Im running 2.5" on mine. 3" really isnt needed unless youre boosted. If I ever make the jump, Im just going to run a cutout for when I want to run the race map, otherwise Id keep it closed while on the street tune.

 

with going too big of a pipe, you lose too much velocity of the exhaust gases which hurts power, especially down low (since they are going slower already) (so having some backpressure is good in that it equates to velocity in the exhaust; but i am only talking maybe 1-2 psi in back pressure at the exhaust manifold while at redline)