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Originally Posted by 986NY
Hi Guys,
I have a 2002 Boxster S and I thinking of installing a Fabspeed secondary cat bypass pipe. These pipes eliminate the secondary cats. ...
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I've got the Top Speed Pro-1 test pipes and they improve the sound at idle, making it a bit deeper. The car also sounds better as you rev it, but I don't have any recordings.
As to power increase, it's been so hot that I can't fairly judge but maybe some due to the improved flow and saving 7 pounds per side.
When the weather gets cooler in October I should notice a difference.
A worthwhile mod based on my experience.