ok guys, in need of a little help. installed up pipe with no cat and bell mouth down pipe with no cat on my 2002 wrx. throttle response is poor until boost builds up. from a stand still, i can nail the throttle wide open and it doesn't pull hard at all until around 3500 rpm (max boost). boost isn't the issue and the car runs perfect, no stumbling, no nothing, no check engine light, no codes, just poor throttle response.