SLIDN7

Got under my car a couple of days ago and noticed that after the RB headers the exhaust pipes are old and all worn out, I wanna change the pipes to 2.5 but dont know if thats to little or big for this car, keep in mind its supercharged with stock exhaust.
Wanna change the exhaust too but dont know whats out there other than RB.

Any input?

Super82

iTrader: (1)

Doesn't sound bad. I'd consider to be 2.5" to be a bit big for any other car but for a forced induction I'd say you could pull it off. Whats your plan? Get new headers?

SLIDN7

im keeping the RB headers their like 2 years old.

PercentSevenC

I'm doing 2.5" for my new system. It will go like this: modified RB header -> collect into 2.5" -> RB FC presilencer -> 2.5" Borla ProXS. I'll be using all RB .120" wall pipe.

BlackWorksInc

I always assumed that Rotaries liked to breathe better... (My personal opinion is that you should not need anything over a maximum of 3" unless you're running some serious F-ing boost)

But that was because the old racecars suffered a loss when they changed the regulations to a smaller diameter exhaust...

SLIDN7

Ill be going with 2.5 straight back to the exhaust then.

twinkletoes

iTrader: (17)

2.5" is perfect. I plan running that after my 13b 4 port SP build.

Hyper4mance2k

iTrader: (40)

everyone that races competitively and wins runs 3"
search around the naturally aspirated section and have your eyes opened. it really comes down to your ports and where you want to make peak torque.