Wilbert350 Posted April 27, 2018 Share Posted April 27, 2018 I have a Scorpion Backbox, but am wondering whether a Y pipe will be the halfway house to going full decat - without the MOT faff. Cheers! Quote Link to comment Share on other sites More sharing options...
Jack94 Posted April 28, 2018 Share Posted April 28, 2018 Which Y pipe have you got at the moment? I don't think an aftermarket one would really change the noise/volume much but you might see some bhp gains if you've got the oem one currently. Have you considered high flow cats? They're about the half way point between oem cats and decats apparently and should be MOT friendly. Quote Link to comment Share on other sites More sharing options...
Wilbert350 Posted May 3, 2018 Author Share Posted May 3, 2018 Hi mate, I've actually just finished fitting and then re-gasketing my new resonated decats. Unfortunately I have a hissing behind me - not sure if this is down to a pretty sorry looking Y pipe & Flexi joints on this. Quote Link to comment Share on other sites More sharing options...
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