[iBlueVirus]

what is the best size for MY02RS when it comes to selecting an intermediate pipe? Is 3" for WRX only? I've heard 2.5 and 2.25... what do you guys have?

 

[blitzkrg-RS]

2.25" piping is good enough for 2.5RS. i think 2.5" will lose some low end torque but some improvement on the high end.

 

[HondaH8er]

I left the stock mid-pipe on when I put my Stomung exhaust on, and it seems to work pretty well together. Just doesn't seem like it would be worth the money for the midpipe to free up maybe 1 horse, especially at the risk of losing low end. Actually, I'm not even sure what size the stock mid is.

 

[MrJosh43]

I have a 2.5" catback and have had barely noticeable low end loss, if any. Top end feels a bit better, but isn't earthshattering I doubt the gains would be all that much different from the 2.25" catback. I bought the 2.5" thinking it would compliment future FI mods better... and now I'm selling my car... lol time for a wagon to haul all these parts around for my business... possibly one with an STi drivetrain swap

 

[hairy bean bag]

i have a full 3" cat back,you loss a little on the bottom end! but the top end has good power to redline. ya and when you hit the squeeze it's even better!