yes and no, really depends

yes = more power gain, less restriction and better flow
no = will fail MOT and depends if you want the hassel of getting it refitted and removed every year

but why not go for a sports cat?
 
yup i agree with martyn, you wont know any difference what so ever, just a FAIL on your MOT certificate and maybe a fine if the old bill does a random spot check and yes some of them DO check the emissions (mostly old cars) but if your cars muppeted theyll try everything to get their crimbo bonus!
 
^^ as above...he has a k03s turbo...so if he hadnt upgraded his exhaust system already, it would be pretty pointless

as it is...it would be pointless losing the sports cat for a decat...minimal gains and vast amount of problems
 
if you have a decat and crash then the insurance come out to have a look i don't think they will pay out as said above it will be a MOT failer even if you do switch it for the MOT
 
its not maybe dodgy set of rollers me thinks unless of course you have paper evidence. anyhow back to subject dont get de cat not worth the hassle and cats are alot better now adays just stick with sports cat if you want to. were not here to change your mind blinker you just point you in the right direction.