I currently have a Apexi World Sport catback on my car and I am getting ready to boost within the next two months. I know WS is a pretty small exhaust, would I see more gain with a different exhaust at all? When I bought the WS I was looking for something quite and didnt know I was going to be boostin'

 

I am running a 2.5"DP to 2.5"TP to an Apex'i RS (old version of the WS), and I made ~247/174@ 7PSI. And its pretty damn quiet.

 

I would get a bigger exhaust... like 3inch or keep that exhaust on there and run a e-cut out at the downpipe... but thats just my 2 cents..

 

i had the WS on my civic si for a while when i first got boosted. I had a 2.5" DP to the WS cat-back with my stock cat. when I went to a 2.5" DP, 3" cat and 3" exhaust all the way back, it made a HUGE difference in power and spool time. My opinion is go 3" all the way.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by newgsrdriver &raquo;</TD></TR><TR><TD CLASS="quote">I am running a 2.5"DP to 2.5"TP to an Apex'i RS (old version of the WS), and I made ~247/174@ 7PSI. And its pretty damn quiet.</TD></TR></TABLE>
Nick, dont you think that if you had a full 3" those numbers would have been at least 20hp higher though?

 

That I dont know...

I mean think about it, how many 270whp@7PSI motors have you seen?! Ive seen 2...maybe Im modest, but I cant imagine my baby would be THAT successful I was thrilled with 250@7PSI!

If I can, I will try to pop a 3" on and see what it does for me along with some dynos so you guys can see the difference for yourself as well. I just want to make sure I can do it without spiking with this Drag mani