Originally Posted by
Sleepstream
Tell me the difference in them on a +4?
Last time out I felt my car was struggling with mid to top speed with a 9901. Please share you're views as most of the tracks i run has long straight/sweeping corners and very little jumps.
or recommend other pipes..
That is exactly how I feel the 9901ss performs or doesn't perform , I did however use a 41005 header on the pipe and it definitely helped but the 98543ss is much less restrictive and offers way better performance . IMO