Shaun 57 Posted February 10, 2021 Share Posted February 10, 2021 Hi everyone , can you put a 3 inch bore decat on say a 2.5 inch bore and so on ? Quote Link to comment Share on other sites More sharing options...
TomsFocus Posted February 10, 2021 Share Posted February 10, 2021 Not without a lot of exhaust paste... 2 Quote Link to comment Share on other sites More sharing options...
StephenFord Posted February 10, 2021 Share Posted February 10, 2021 I have seen Ant on Wheeler Dealers fabricating such a downstep tube, but he is brilliant at metalwork, and had a very specific (expensive looking) machine to do it LOL Oh, just found this on Ebay...(Cheap too!) 1 Quote Link to comment Share on other sites More sharing options...
Luke4efc Posted February 10, 2021 Share Posted February 10, 2021 I bought this cheapo decat from eBay 2 years ago and has been fine (although they've put the price up by a £15 since I bought it). I wouldn't bother with a branded de-cat as long as it's stainless. You'll also find decats that are straight (notice how the one i linked has a small kink in the middle of it). The straight ones make your exhaust tips go a little wonky as it pulls the exhaust over (the original decat is also kinked). If you haven't had the car remapped then you will get an error code for exhaust emissions. Fit one of these elbows where the o2 sensor goes and it should help stop the light coming on all the time. To actually answer your question, the cat is flanged either side so is pretty easy to remove (apart from the o2 sensor if it's been in for 15 years, have fun with that). Both flanges for the 2.5" stock system and 3" decat are the same dimensions in terms of bolt holes, so yes it will fit fine with whatever system you have, and plan on using at a later date. Quote Link to comment Share on other sites More sharing options...
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