How effective is a performance cat, does it offer much improvement over the stock one?
or is it worth ditching both and just getting a straight through mid-pipe. Only thing that worries me with that is implications with insurance, would it invalidate a policy as car would no longer be street legal??
Why would being catless be illegal for street use ?
I have heard from a few people that high flow cats make a good improvement on power but my mechanic don\'t think so as the stck cat is alot bigger than the aftermarket ones he finds it hard to believe that they would flow better being so small in comparison.
rgds
Just every place that sells mid-pipes always advertise them for off-road use.
I know you need to put cat back on to get an MOT so I thought that they wouldnt technically be legal on road (not thats it likely to ever get found!)
If theres no implications then ill go for a mid-pipe, cheaper + more horses! but i wasnt sure hence post
They probably say that because of the noise. Plus it would depend on what year the car is manufactured. I think it\'s anything before Aug 95 does not have to have a cat test, unless obviously it has a cat. That\'s the good thing of sva\'invg pre Aug 95 rx7\'s they are so much easier to get through the emissions test because of this.
rgds
I dont think hi-flow cats are that much more expensive (about £100-£150), they increase your emissions slightly but improved fuel economy apparently.
Heres a cat:
http://66.216.67.51/product.asp?0=210&1=257&3=312 (http://66.216.67.51/product.asp?0=210&1=257&3=312)
And midpipes, not much difference in price to warrant the hassle of changing at MOT time really, thats if they do work as well as they sound?
http://66.216.67.51/subcatmfgprod.asp?0=210&1=255&2=-1 (http://66.216.67.51/subcatmfgprod.asp?0=210&1=255&2=-1)
QuoteOriginally posted by BNA_ELLIS
They probably say that because of the noise. Plus it would depend on what year the car is manufactured. I think it\'s anything before Aug 95 does not have to have a cat test, unless obviously it has a cat. That\'s the good thing of sva\'invg pre Aug 95 rx7\'s they are so much easier to get through the emissions test because of this.
rgds
i thought it was 1992 the year that cats were demanded legally??
mine\'s 96 so miss out either way :(
I had heard \'92 aswell, anything before a k reg which is 93 I believe.
For road use a car must have a cat after August of 92.
Kind regards
Carl
I know Aug 92 cars need to have a cat but I did not no it was a matter of legality. As all pre Aug 95 cars never have a cat test done at sva testing centre. I don\'t know if tehre is a difference then in MOT\'s I ask the vehicle inspectorate up to this week actually during a sva test and they said that the original ruling was 92 but the date kept getting pushed back for when it was mandatory for all uk cars to have cats as standard all the way unitl Aug 95. :confused:
Yet as I had hard ly slept the night before the sva test I probably had all me wires crossed.
rgds