biggy119 Posted November 14, 2014 Share Posted November 14, 2014 Hello guys im considering. Taking the cat off my focus 1.8 tdci 59 plate next week cutting the top off taking the inside out then welding it back up . Do you think this could be a problem or a gain ! ?? Views please Quote Link to comment Share on other sites More sharing options...
theduke Posted November 14, 2014 Share Posted November 14, 2014 Free's up a few revs and they only smoke test diesels for mot its win win imoa, Quite a common mod on older astra 1.7's Quote Link to comment Share on other sites More sharing options...
biggy119 Posted November 14, 2014 Author Share Posted November 14, 2014 Would it be worth doing Quote Link to comment Share on other sites More sharing options...
TomsFocus Posted November 14, 2014 Share Posted November 14, 2014 They check for presence of a cat on diesels now so if its obvious its been cut out it'll fail MOT. If it still looks original it'll be fine. On my previous decatted diesel I gained some top end noise but lost a bit of low end torque. So pros and cons, as with anything. Quote Link to comment Share on other sites More sharing options...
biggy119 Posted November 15, 2014 Author Share Posted November 15, 2014 I can get the mot done . I just don't wanna do it and think o I wish I never did it now Quote Link to comment Share on other sites More sharing options...
Dee_82 Posted November 15, 2014 Share Posted November 15, 2014 just depends on whether they see it or not an passes smoke test, didn't someone say the euro 5 engines will be getting some sort of new test that might highlight a missing dpf? Quote Link to comment Share on other sites More sharing options...
biggy119 Posted November 15, 2014 Author Share Posted November 15, 2014 I'm not sure about that Quote Link to comment Share on other sites More sharing options...
TomsFocus Posted November 15, 2014 Share Posted November 15, 2014 The 1.8 doesn't have a DPF though Dee, just a cat... :) 2 Quote Link to comment Share on other sites More sharing options...
biggy119 Posted November 15, 2014 Author Share Posted November 15, 2014 Tom your right ! Quote Link to comment Share on other sites More sharing options...
TomsFocus Posted November 15, 2014 Share Posted November 15, 2014 I know I am haha...kinda wish I'd gone for a 1.8 over the 1.6 now I'm having DPF issues. But the higher tax and fuel costs would roughly cancel it out anyway if my maths is right lol. Its up to you really, as I said, on a previous car it wasn't really worth it for me, and on the identical one that followed I kept the cat but got a stainless cat-back instead. Looks, noise and slightly more top end without reducing the low torque. Obviously different engines will perform differently with a decat though. Quote Link to comment Share on other sites More sharing options...
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