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Originally Posted by Johnny Danger
The secondary are completely superfluous . Its merely a case of Porsche having a "belt and suspenders" approach to emissions/OBDII compliance. They're like having an extra set of thumbs. Get rid of them !
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Had to google superfluous as im not really good at A.english but I think its the first set of cats that should go in the first place.Problem is that the O2 sensors are placed there. A ( Porsche) mechanic told me that they where only really efficient at startup and lower temperatures before the secondary set starts to work a minute later. This is also how the RoW cars are designed . When you look at the pre-cat they do not seem to approve a smooth flow through them.
But all the problems involved with getting rid of the first ones, broken bolts ,O2 sensors scares me a little bit.
Strange thing is that a lot of companies sell dirt cheap headers but are not able to supply a simple bypass pipe for that price.