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Old 06-21-2018, 09:54 PM   #8
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Join Date: Mar 2016
Location: Spain
Posts: 891
Originally Posted by 10/10ths View Post
Consensus among the cognoscenti is that best power is obtained by cheap Chinese long tube headers with NO cats feeding secondary pipes with hi-flo cats wired up to send the proper OBD signal and then the muffler of your choice.
Out of curiosity, why do the long tube no cats with cats in secondary, produce more power than, short 200 cell cats, with no secondary? Generally same set up, with cats in a different position. Must be the design of the longer tubes.

The UK has exhaust test for inspection, that setup still passses?
2000 Boxster S Ocean Blue Metalic
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