I am having a delima on what size exhaust to run on my 5.3 swap. I am using 2000 - 2002 fbody manifolds and it is gonna be hard to run a full 3" exhaust off of the manifolds.

My question is: Being i am probably gonna have to run 2 1/2" dual exhaust dumped infront of the axle, and the 5.3 is basically stock(but will be getting heads cam, and headers withing the new year), will 2 1/2" dual exhaust be sufficient?

Sorry for the rambling guys, but i just want to get all i can out of the 5.3

Thanks,
Ryan

 

I think a single 2.5 ofr y pipe into a 3 inch single exhaust is sufficent to support any amount of power an NA 5.3 can make. If your going with an adder Id go with the duals other than that I think its overkill and in certain scenarious might actuall hurt power under the curve.

my .02

 

If you are wanting duals, 2.5" will be fine even with the mods!!

 

These gen III motors like some backpressure therefore the 2.5 would work just fine as long as you arent pushing over 700hp. (i quoted this from the exhaust guy giving me a pricequote after i did my headers. I asked him the same question)

 

sounds like the 2.5 will work. i am using the aerochambers, this thing isnt going to have that popcorn popping sound is it?

 

I have dual 2.25". Should I have gone with 2.5" or will the 2.25" flow enough?

 

i went with the 2.5 and aerochambers dumped before the axle, fuckn sounds wicked

 

yes. 2.5" tubing will be more than sufficient for a dual system.

 

i have 3 inch single off the y pipe with no muffler and tips out the back . people tell me all the time it sounds like a race car . and to shave a second off my 1/4 time with just intake , free mod and that it must have helped but who knows , i want to add a corsa sport muffler dumped but cant find one right now

 

guys on the SS forum used to have one for sale....but he wanted like $300 for it.