MtnCRX

I plan to upgrade my exhaust system because of a jr supercharger on my 89 si running 9-10 pds of boost.
-I currently have a dc 4-2-1 header, but the collector is only 2 inches (if even that). Should i buy a whole new set from Kamikaze w/ the 2.5 collector or just switch out the downpipe for a custom job at a muffler shop. Also, does anyone know the diameter of a Powercore Racing Cat?

White Smoke

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by MtnCRX &raquo;</TD></TR><TR><TD CLASS="quote">I plan to upgrade my exhaust system because of a jr supercharger on my 89 si running 9-10 pds of boost.
-I currently have a dc 4-2-1 header, but the collector is only 2 inches (if even that). Should i buy a whole new set from Kamikaze w/ the 2.5 collector or just switch out the downpipe for a custom job at a muffler shop. Also, does anyone know the diameter of a Powercore Racing Cat?
</TD></TR></TABLE>
The header will be fine, I would spend that $$ elce were IMO. (like a good EMS and tune)
I am sure you can get the Powercore Racing Cat in diffrent sizes. I would contact them directly
There is alot of good info on this site! I would try the search button