I just tuned a friends rsx with a jackson racing supercharger and it made 264hp and 189 torque at 7 psi of boost using k pro. i would like to get 270 out of it before putting on the 9 pound pulley and a walbro on it. heres my question right now hes got a 2 3/8 inch exhaust on it which is probably helping out the torque but choking the flow up top. his header has a 2.5 inch outlet so would going to a 2.5 inch exhaust pick up at the 6 extra hp and be enough for the 9 pound pulley or would going to a 2.75 be better since the bigger pulley will probably make up for the torque lost and gain more top end? just tell me what you guys think.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Fat Hatch &raquo;</TD></TR><TR><TD CLASS="quote">I just tuned a friends rsx with a jackson racing supercharger and it made 264hp and 189 torque at 7 psi of boost using k pro. i would like to get 270 out of it before putting on the 9 pound pulley and a walbro on it. heres my question right now hes got a 2 3/8 inch exhaust on it which is probably helping out the torque but choking the flow up top. his header has a 2.5 inch outlet so would going to a 2.5 inch exhaust pick up at the 6 extra hp and be enough for the 9 pound pulley or would going to a 2.75 be better since the bigger pulley will probably make up for the torque lost and gain more top end? just tell me what you guys think. </TD></TR></TABLE>

for forced induction... bigger exhaust is better.