986 Forum - The Community for Porsche Boxster & Cayman Owners - View Single Post - Top Speed Bypass pipes initial impression

Steve Tinker · 10-03-2012, 03:03 PM

black box...
If you are planning to fit John's (Che) headers, here's a tip which I learnt when I fitted mine last year. Before installing the headers, slightly enlarge the bolt holes as the originals line up with the head OK but I found that it left no room for slight adjustment to fit the bolts. One header was good, but the other required the slight movement to fit.
Installing the Top Speed headers & cat delete pipes coupled to the original Porsche S muffler certainly sounds good without the dreaded 3000 rpm drone. But here in Australia we don't have the primary cats in the headers (ROW specs) so it may be a different story your side of the ditch....

10-03-2012, 03:03 PM	#57
Steve Tinker Registered User Join Date: Dec 2008 Location: Queensland, Australia Posts: 1,522	black box... If you are planning to fit John's (Che) headers, here's a tip which I learnt when I fitted mine last year. Before installing the headers, slightly enlarge the bolt holes as the originals line up with the head OK but I found that it left no room for slight adjustment to fit the bolts. One header was good, but the other required the slight movement to fit. Installing the Top Speed headers & cat delete pipes coupled to the original Porsche S muffler certainly sounds good without the dreaded 3000 rpm drone. But here in Australia we don't have the primary cats in the headers (ROW specs) so it may be a different story your side of the ditch.... __________________ 2001 Boxster S (triple black). Sleeping easier with LN Engineering/Flat 6 IMS upgrade, low temp thermostat & underspeed pulley. 2001 MV Agusta F4.