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

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

Would it be worth doing

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.

I can get the mot done . I just don't wanna do it and think o I wish I never did it now

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?

I'm not sure about that

The 1.8 doesn't have a DPF though Dee, just a cat... :)

Tom your right !

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.