I am no stranger to the car hesitating above 5k under wot which I already heard might be able to be resolved with a flash at the dealer. That wasn't a major concern at the moment since I don't punch it regularly. I installed the Nisei 2pc type B UICP tonight and took the car out, I believe there is a leak since I hear a whistle above 4k RPM audible over the turbo spooling sound but when I pass 5k RPM the car began to jerk instead of the hesitating it would do before. Does anyone know the reason for this? Also, is it common not to hear the factory bov anymore under full throttle? I still hear it when I'm shifting outside of WOT but not when I'm shifting while getting on it. Any help would be appreciated.

 

Sounds like a major boost leak. The fact that you can already hear it above 4k seems to indicate that. If this is the case, you're getting the jerking because you're leaking so much air, that the A/F is beyond rich and causing the jerking. Just a guess.

 

i have a 2pc also and it took me 2 tries to get it right since it was such a tight fit.

i take it you don't have a boost gauge?

 

Negative on the boost gauge

 

you got a leak, it also took me 2 tries to get the pipe in the right position

 

Thanks for the info guys, I found the problem today, a couple of clamps were in fact causing a leak so after a trip to buy better tools I got the problem fixed.