86-Rich 5 Report post Posted May 9, 2018 hi guys at the moment i have the HKS cat back exhaust,was looking at getting the complete system maniford and front pipe hks as well,the front pipe has no CAT but the maniford does,then was thinking a remap to get rid of the torque dip,my question is do you think it pass emissions mot test with the full hks system? as id only have the CAT in the maniford and the cat back which are both aftermarket? also do you think it would be really loud? as im not after loads of noise Share this post Link to post Share on other sites
surrey86 352 Report post Posted May 9, 2018 Depends which cat back it is, HKS make loads. Share this post Link to post Share on other sites
86-Rich 5 Report post Posted May 9, 2018 i have the HKS Hi-Power Spec-L cat back Share this post Link to post Share on other sites
Andrew Smith 156 Report post Posted May 9, 2018 I stand to be corrected but to rid of the torque dip it is better to decat the mani and keep the second cat. Share this post Link to post Share on other sites
86-Rich 5 Report post Posted May 9, 2018 i just wanted to keep the whole system HKS but the front pipe they only do as a no CAT,so guessing id need a CAT in the maniford at least otherwise it would just fail MOT? even with a CAT on the maniford and the cat back im not sure if it would pass tbh Share this post Link to post Share on other sites
Andrew Smith 156 Report post Posted May 9, 2018 Mine passed its mot with a TD mani and overpipe a stock everything else. Torque dip has become a slight bump and the tone has become fruitier but not really any louder. You could always go the whole HKS system and just slip the second cat in for the mot, its not a massive job unless the HKS is one piece to the overpipe Share this post Link to post Share on other sites
Kodename47 446 Report post Posted May 9, 2018 There's no real benefit of keeping the whole system the same make FWIW. Also the quality and size of cat in the manifold will be the decider of whether it would pass an MOT. As Andrew said, better off with a decent cat in the front pipe and go decatted manifold, but that's just me. Power wise, leaving the OEM front pipe in will "lose" you such a small amount you'd never notice IMO. Share this post Link to post Share on other sites
86-Rich 5 Report post Posted May 14, 2018 ok thanks guys looking to find some gains NA route,i know its not easy,i also hear induction kits are pointless as well Share this post Link to post Share on other sites
Lucas 244 Report post Posted May 14, 2018 35 minutes ago, 86-Rich said: ok thanks guys looking to find some gains NA route,i know its not easy,i also hear induction kits are pointless as well I wouldn't say pointless. Though, to some, they don't do enough difference to justify a few hundred pounds. For example, Injen EVO2000 kit has proven to gain an increase of 10+bhp. (They're also on offer with us right now. £330 for forum members) Share this post Link to post Share on other sites
