<font face="Verdana, Arial" size="2">Originally posted by SERboy:
humm....whats the diff b/t a flex joint and a flex pipe?..anyways, what is the internal diameter of the piping before the cat?...to me it looks kinda small...</font>
Flex pipe is what you see in that photo. Flex joint is like two pipes joined together by 2 bolts/nuts but are still able to "flex". I know... Terrible description, but flex joints are what you DO NOT want. More prone to leaking, from what I've been told.
The diameter of the piping to the cat is around 2". Yeah, it is small, but some testing done by Mike Kojima has shown that going to a bigger pipe will lose power. IIRC, the Hotshot Gen1 headers had a 2.25" pipe going to the cat, but they changed that for the Gen2 and so on...
--Andrew Phan
1998 200SX SE-R (HS Gen3, but not for long)
1993 NX2000 (stock, but inheriting HS Gen3)