After Market Exhausts
Discussion
MoT test should be OK but the SVA test might be a problem if its a new car and the exhaust is very loud. Probably best to get the SVA test done with a standard exhaust then swap to your loud one afterwards.
Interesting report in the current club mag saying that they had an SVA failure because the small switch used to operate the fog lamp was too sharp and had to be rounded off or replaced. The mag also gives some useful phone numbers for workshops who can do SVA preparation.
Interesting report in the current club mag saying that they had an SVA failure because the small switch used to operate the fog lamp was too sharp and had to be rounded off or replaced. The mag also gives some useful phone numbers for workshops who can do SVA preparation.
gtrclive said:
SVA Tests now require you have the standard exhaust system fitted, as after market systems invalidate the emmisions...
I know it Boswelox's but that's what the man told me so I have had to remove my Boral System to get though the SVA......
Somewhat strange. The MOT checks emmissions and my C5 complete with Borla exhaust has no problem. How can you invalidate emmisions? You either meet the measurements or you don't, which is what that part of the MOT is all about.
It's not emissions, it's noise. Most SVA centres will pass a stock system subject to evidence of compliance and modified systems subject to it only being modified downstream of the cats and using the stock silencer.
HOWEVER, the SVA manual I have says this only applies to Enhanced SVA and a left hand drive vehicle is exempt which suggests it can be as loud as it likes. Most SVA centres do not test emissions if the car complies with the FMVSS or whatever it's called. My Z06 wasn't tested.
HOWEVER, the SVA manual I have says this only applies to Enhanced SVA and a left hand drive vehicle is exempt which suggests it can be as loud as it likes. Most SVA centres do not test emissions if the car complies with the FMVSS or whatever it's called. My Z06 wasn't tested.
MOT rules on emissions vary with year of manufacture - hence I hav eno need for a cat on my 86. I've got stainless dual exhaust system, cheep aluminised muflers, but with the rest of the system straight through (and of course none of aforementioned cat) it is sufficiently loud! Emissions come out at 1% CO for the MOT, well under the (I think) 3.5% required for this year of vehicle.
As for later cars - for MOT - it's still only a check that your car meets the emissions (CO and Hydrocarbons, HC) limits for the relevant year. And of course leaks and security of the system. Although my mate's maestro failed its mot after the exhaust broke, so we welded what was left of the rusty system back to gether to give a special edition side exit exhaust - hmm....
As for later cars - for MOT - it's still only a check that your car meets the emissions (CO and Hydrocarbons, HC) limits for the relevant year. And of course leaks and security of the system. Although my mate's maestro failed its mot after the exhaust broke, so we welded what was left of the rusty system back to gether to give a special edition side exit exhaust - hmm....
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