So I just installed a grimmspeed downpipe and flashed to stage two, fixed an exhaust leak yesterday and we disconnected a hose coming from the bypass valve to what seemed like the intake manifold. Now it sounds like a screeching monkey under boost and boost fluxuates and stays negative until...

so, I don't mean to have a clickbait title.. I am generally curious about what a "tune" is. The context for this question: I just got a 2002 WRX with upgraded Megan racing downpipe, grim speed uppipe, and Thrust 3" exhaust... (does this make the car stage two?) I am super new to tuning and...

Hi everyone, Few quick questions.. I have a 18’ WRX which I purchased 5k miles ago. It had a Subispeed axleback exhaust and wheels. I’ve added Cobb Big SF and AP my question is I just purchased a Cobb catted resonated J pipe and wondering if I just wait to put it on or install it this week...

I ended up not needing the Perrin down pipe and never got a chance to even install it so it is still brand new. http://www.clubwrx.net/forums/sws-local-sale-only/134340677-perrin-subaru-wrx-sti-catted-downpipe-down-pipe.html In case anyone was wondering the cost without looking at the link...

Hey any of you think if its worth getting just the down pipe on a stock exhaust for 04 WRX? Will it make any performance changes or sound improvements?