box100 Posted November 27, 2021 Report Share Posted November 27, 2021 I have a CEL with PO421 and PO431 fault codes. I’ve tried new lamba sensors and also extenders with no success so it looks like I need new cats. They could be very expensive but saw these universal ones 2''Inch Universal Sports Catalytic Converter High Flow 200 Cells Stainless Steel on eBay for under £100 each. Does anyone know if these are any good and if / how easy they will be to fit? Quote Link to comment Share on other sites More sharing options...
iborguk Posted November 27, 2021 Report Share Posted November 27, 2021 (edited) 32 minutes ago, box100 said: I have a CEL with PO421 and PO431 fault codes. I’ve tried new lamba sensors and also extenders with no success so it looks like I need new cats. They could be very expensive but saw these universal ones 2''Inch Universal Sports Catalytic Converter High Flow 200 Cells Stainless Steel on eBay for under £100 each. Does anyone know if these are any good and if / how easy they will be to fit? No experience of them , although my spidey senses are saying Ebay + £67 + the usage of the word Universal tells me I wouldn't go there. Edited November 27, 2021 by iborguk 1 Quote Link to comment Share on other sites More sharing options...
earley231186 Posted November 27, 2021 Report Share Posted November 27, 2021 The issue you have is the cats are built into the manifolds. So how would you attached the eBay ones? The original cats are all but extinct, I spent months looking for second hand ones. There was non anywhere. Best option is the Topgear sports cats. But beware of rusted manifold studs. 1 Quote Link to comment Share on other sites More sharing options...
box100 Posted November 28, 2021 Author Report Share Posted November 28, 2021 (edited) 9 hours ago, earley231186 said: The issue you have is the cats are built into the manifolds. So how would you attached the eBay ones? The original cats are all but extinct, I spent months looking for second hand ones. There was non anywhere. Best option is the Topgear sports cats. But beware of rusted manifold studs. Thank you, I doubted they were viable, the Topgear ones look very good, did you or do you know of anyone who fitted them? I have read the CEL on the early 987.1 had a very close tolerance for cats and I wouldn’t be that surprised if I fitted them and still got the alarm. Edited November 28, 2021 by box100 Quote Link to comment Share on other sites More sharing options...
mneil Posted November 28, 2021 Report Share Posted November 28, 2021 I fitted topgear manifold with 200 cell sports cats to my 981s a few years back. Improved torque, sound and no fault codes😃. 1 1 Quote Link to comment Share on other sites More sharing options...
earley231186 Posted November 28, 2021 Report Share Posted November 28, 2021 3 hours ago, box100 said: Thank you, I doubted they were viable, the Topgear ones look very good, did you or do you know of anyone who fitted them? I have read the CEL on the early 987.1 had a very close tolerance for cats and I wouldn’t be that surprised if I fitted them and still got the alarm. I've not. I managed to locate one standard manifold to replace my split one. I have seen people use extenders on the sensors of they throw codes. But alot of people are running the Topgear cats I believe. Its those or the standard items from Porsche at about 1600 quid a side. 1 1 Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.