by Robbks » Tue May 21, 2013 11:37 am
yes,
All of the above
simply replacing the cat back is a good upgrade on the B4, especially if your variable opening rear muffler no longer works.
replacing the dump pipes gives great gains but will usually have to be custom.
But I urge you to consider upgrading it to single turbo where you'll find more power, better driveability, better economy and much less headaches
coyote wrote:Sure, a GTR is fast ... but it's about as interesting as listening to grass grow.