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Originally Posted by spongebob
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.
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I agree with you in so far as the RoW design is concerned, to include how most "tuners" (especially the European ones) prefer to configure their exhaust systems. However, the difficulty that I first encountered was finding high quality cats with the appropriate cell count for my application. And, secondly, finding ones that had the correct design lay-out so that they could be incorporated mid-stream. Therefore, in order to simplify the process, I decided to stick with the principles of the oem design and improve upon it in ways previously mentioned. This approach ruled out the need to add "bungs", re-route O2 sensors and possibly have to re-program the ECU.
Moreover, this was a design that I noticed that some of the top European "tuners" were utilizing in their 987 exhaust programs.