I\'ve just fitted a new cat back exhaust to my FD3S and wanted to get a replacement down/front pipe and mid pipe to really open her up. Does any one know the legality of doing this to a road car and how it will effect getting an MOT?
Any help would be much appreciated.
I take it your car is an import? Replacing the down pipe will not alter the legality of the car, how-ever replacing the cat [mid pipe] with a de-cat pipe will effect your immisions - you overcome this by fitting an apexi pfc and commander so that you can alter the A/F ratio for the MOT.
Hope this helps.
Excellent stuff, certainly does mate. Thanks for your help.
Cats weren\'t introduced untill late \'92 so an early \'92 car doesn\'t need to have one :-) (like mine). This means you\'ll only have to pass the much less strict non-cat emissions test.
Iain
What sort of power gains would you expect from putting on a de-cat and a down pipe?
QuoteOriginally posted by dturpin
What sort of power gains would you expect from putting on a de-cat and a down pipe?
around 30 bhp
Excellent I reckon I would be at about 300bhp with that, any sugesstions where to get a down pipe from?, as my mate can weld me up a stainless de-cat.
Also does it make the exhaust louder as mine is quite loud at the minute?
noise depends on make some are only a little noisier than stock others are too loud??
I\'ve got a WGT silenced de-cat pipe and the stock jap downpipe (i.e. no pre-cat) with the cat-back that came with the car and it\'s only a tiny bit louder than it was with the cat in place. Note is much nicer though - less tinny.
If you\'re looking at any track days then it\'s worth the cost to get a silenced de-cat imho.
Iain
PS. Flew through the MOT today even though the emissions test suprised the bloke as it runs really rich!