Tried searching but couldn't find anything. Anyway my s2 r33 has the following mods, hks silent hi power catback, highflow cat, front mount and 9psi. With these mods it made 178rwkw. When I upped the boost to 11psi it made 182rwkw and I thought it didn't gain much more than I was expecting. I have just bought a jjr 3 inch bellmouth dump pipe to replace the stock dump. What power gain would I be looking at roughly once installed?
Cheers