Race Exhaust?

[Luis325]

Im planing on doing my race exhaust with a dynomax race bullet muffler.
Itd going to be headers coming into a Y and from there 2.5 or 3" tubing to the bulet resonator and out to the side behind the passenger door.

Question is... What size would be better for the resonator/piping ? 2.5 or 3"

Thanks

[ThreeTwentyFissel]

I'd go with the 3" and test pipe...

[nando]

unless you have sound limits at your track.. then you might want to consider a couple mufflers too.

[Luis325]

no sound limits...
3" isnt too big?

[nando]

not if you have long tube headers

it might be too big for stock manifolds though, since they merge too soon.

[sickbro91]

if its a non turbo wouldnt you want it to hold some back pressure? i have a 2.5i impreza and people say dont go any bigger then 2.25 or 2.5 in tubing

[Luis325]

Ok i finally bought some IE Short tube headers!!
On to the exhaust with these headers 2.5 or 3" ???

[nando]

if its a non turbo wouldnt you want it to hold some back pressure? i have a 2.5i impreza and people say dont go any bigger then 2.25 or 2.5 in tubing

no, you never want back pressure. you want velocity, and that comes from the headers.

[slow e30]

if its a non turbo wouldnt you want it to hold some back pressure? i have a 2.5i impreza and people say dont go any bigger then 2.25 or 2.5 in tubing

There is no difference in sound.

People dont understand that a car needs to get rid of the exhaust gases. high flow cats and mufflers wont hurt anything.

i bet people dont know why your NOT supposed to port the exhaust side of a head, just polish it.

all im trying to say is: get the exhaust gases out, dont have any sort of pressure built up.