If you replace your cat with a decat pipe does that affect your emissions and therefore guarantee an MOT failure ?

 

Yes, it does. Put your cat back on for the MOT

 

 

I believe Mark (MB) got through the emissions with a decat. However, this probably won't be the case for all S's. I'd play it safe as Danny says and replace the cat prior to MOT unless you're friendly with the tester...

 

I dont know how the hell he managed that

 

I have a friendly tester


Is there an improvement in the exhaust note without the cat ?

 

Yes, it doesnt seem to drone as much.

 

Mine passed legitimately with no cat.

Quite a few cars do now.

I was surprised as it smells a fair bit!

Got your PM Shipley - mulling it over

 

I've got a friendly mot guy (having it done tomorrow) but dont think mine will have any issues but i may need him next year! Thing is i was talking with a guy who lives in the same block of apartments as my mate and he works for Milltek and says they have a decat pipe for the S which improves throttle response and should release a few extra ponies as well and he says it should work fine with the stock exhaust.

Anyone tried this combination?

Jim

 

Mine bloody stinks!