well y pipe has had proven gains, and also test pipes have had proven gains, the flows are more for the sound i am looking for not really doin it for hp... i was honestly surprised how the flows sounded i really liked the deep tone and rumble...
__________________
2004 350z Enthusiast:
Custom Stereo
Espirit JDM Body Kit "rear molded"
Nismo Wing
Apexi CAI
Rennen 18 spyder rims
Comming Soon:
Turbonetics singal turbo with forged pistons and internals!