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it good to have an de-cat because it removes flat spots, turbo lag, sounds amazing and improves mpg
im not sure that it increases performance
 
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I didn't manage to see a RR readout before, but at a recent RR day, a 320d with just the decat made 170+bhp.
There is a good chance when stock it might out out a bit more than the 150bhp, but even so, reports were of a good noticeable difference when fitted.
 

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and one last thing when decat is fitted on yours it will light up EML on dashboard because yours being a euro 4 engine
 
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Hang on a minute, why do diesels have cats fitted then? (Just out of interest :thumbsup)
Quote taken from EcoTune website :-

"The BMW 320D is fitted with two catalytic convertors which are not required for the MOT smoke test. Your engine will produce lower particulate emissions due to a more complete combustion cycle. Petrol cars differ as they are subject to a full emissions test."

Sludgers 1 - Petrols "nil" :rofl :thumbsup
 

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Because the eu says diesel engines of x size should produce x emission or lower. Just silly rules and reg they dream up to give them something to talk about I think :confused
Just to add to Xmak's post, eu compliance is at point of manufacture and isn't (yet) applicable/relevant to our UK MOT smoke test :thumbsup
 

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Soooooo, the cat does infact reduce emissions but this is'nt required for the MOT?
All petrol cars manufactured after 1992 will have a cat fitted and it is nigh on impossible, especially with euro 4 and 5 regulations to pass an emissions test without one fitted.
Diesels have a more basic smoke test are not tested for C02 so therefore don't require a cat for the test, although they naturally produce less c02 than a petrol engine anyhow but give out a higher Nox volume( hence the addition of adblue on trucks to combat this for euro 5).
 
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