whazzup al.
Q1:all i wanna make on my daily driven evo is no more than 350whp. you think 2.5 ultimate racing downpipe,high flow cat and cat-back can handle this power??? casue i want some low-end torque and i already got 2.5 turbo back except cat-back

Q2:what is the est whp and wtq on 2.5''exhaust , K&N drop in, mbc (20psi), walbro fuel pump , hks 264cams, and custome dyno flash/ 93 octane?

thanks!

 

You should go 3" turbo-back and a HKS RS intake, and you should be at ~350whp.

 

yep

 

Agreed

 

2.5" TBack is fine and directly answering your question, about 330whp.