ory question
Well....when I bought my '99 in 2004 the original owner installed the SLP Y-Pipe to the stock manifolds, then to a Borla catback. Its a good fit with no loss of ground clearance (unlike their headers). I am not aware of any HP gain, however. I do believe Borla makes a y-pipe for stock manifolds as well.
R/
Frat
R/
Frat
Originally Posted by TheBlurLS1
No point in upgrading the stock y-pipe. 
If you are set on a replacement, check out Thunder Racing. They are advertising SLP, Bassanni, and Borla. Other Sponsors sell them as well.
R/
Frat
