got the TSL group N backbox...

was goin to get the deresonated section and the pipe to replace the 2nd cat...

is that legal for road use though??? i know its fine changin the resonated section..

cheers

 

if the emissions are too high with it removed then yes























but who cares, the police won't be able to tell at the side of the road and if you have to take it to the MOT station you can refit the cat before you go

 

No its not illegal, but you must tell your insurance company. Make sure you get a MY06 cat pipe as it is longer than pre MY06. I will only have one sports cat come MOT time and last WRX was fine on just this.

 

I reckon it IS illegal.

If factory fitted with a cat then it should have the cat.

 

ha ha ha ha ha ha grow up

 

I believe its only illegal if the emissions go over your limit. If the car can pass an MOT with however many CATs you have fitted/not fitted then you are fine.

Be aware that cats work much better when really REALLY hot. So if you are removing cats you will need to test the car when it has been taken for a good run.

The police do have road side testing equipment that they can use to test your emissions. If you fail, they have the power to issue on the spot fines, and order you to correct your car within a specified time period. You will then have to take proof of the rectification work to a police station. These tests are rare however

Personally I went down the route of a sports cat.

 

It is not illegal to remove cats.

However your car maybe deemed unroadworthy if it fails an emissions test. Emissions being the key, not the fact if it has a cat or how many are still fitted. If its a roadside check; Plead ignorance (i.e say it must not be running right, will have to get it looked at) get a defect notice and then get it re-MOTed at your own cost (after refiitting the cat ).

As long as there is still a cat fitted (somewhere, seeing that scoobs have multiple cats), then as long as the engine is running ok, then removing a surplus cat will not pose as a problem with emissions.

 

Best option if you are at all concerned. I believe MOT emission requirements are less than New Car standards for emissions which is why there is scope to remove cats and still be running within legal limits. It is however illegal to misrepresent your car to your insurance company, so make sure you cover yourself by telling them of your modifications. Being uninsured is illegal

 

There's an awful lot of debate going on about this.....

Take it off and stop being a bitch

 

Is your car just a STI or with ppp ?

If just a sti remove it, as you still have the cat in the downpipe, so still should be road legal.

If ppp, there's no cat anyway so why change !

 

Spot on.

I've removed the resonator section and small front cat section (NOT the downpipe cat) in my MY07 spec.D with no problems at all. As has been said it has a total of three cats (or is it two on the STi?) in the system to keep the emmissions within the limits and removal of one shouldn't affect it.

I also did exactly the same thing on my MY03 WRX and it flew through the MOT with no problems.

PS: Gives an added bit of burble back too.

 

An Sti only has one cat .... in the down pipe.

bob

 

Is the cat in the hawkeye STI downpipe a sports cat as standard or should you upgrade it?

Removing the resonator type thing (very technical me) in the centre section improves the sound of the 2.5 STI. It's a bit quiet with it... even for me who isn't into big booming exhausts at all.

 

I thought on my 05MY STI there were 2 cats, then when PPP was fitted the 1st cat was replaced with a sports cat and the 2nd cat deleted?

 

Thought standard sti 8's had 2, downpipe and center Bob.

Don't sti 8's with ppp have just the one in the downpipe ?

 

Just to clarify the LAW,,,,

Under construiction anduse regulations it is illegal to change any part of the emission compliance equipment with anything other than a copy or an item tested and verified as still passing the emissions requirements of that car new when driven over the drive cycle.

Its highly unlikley FHI would pay the extra £80 odd quid for a catalyst that wasn't needed, so its likley that removing the cat would fail the emissions test (even though it will pass an MOT) as at the high flow rates (the cycle goes upto 120kmh - 75mph) that the downpipe cat can't convert well enough and pollutant breakthrough would occur.

So yes it is illegal to remove that cat, although it would pass an MOT and a roadside emissions check, although if the checker looked under the car and could see that a catalyst wasn't there that should be he could impound the car, in practice its unlikley to happen as 1/ we have very few roadside checks, and 2/ they probably arn't familiar enough with the car!

Thats why I like the STi decat centre on mine, Subaru part numbers and looks like a cat!

Simon

 

So PPP is Illegal then !

 

No, it's still legal as we've homologated it. It passed all the relevant Euro noise and emissions limits so is 100% legal.

This doesn't mean that another exhaust or removing a cat is legal, it won't be as it won't have been tested. No other silencer will be legal unless it's been approved either on the car by the VCA (can't happen unless you are the manufacturer/Importer) or it's got an E mark.

Mike

 

Mike is of course correct, its the testing and/or homologation thats improtant, although I didn't think the PPP was actually homologated (and hence can only be fitted to an already registered car, like for example the Cooper Works kits to mini's), but testing it and showing no effect is as acceptable.

Note that remapping a car is also 'as illegal'.

Simon

 

Jesus, my car is soooooooooooo illegal I better not tell anyone about it
The wifes STi PPP only has one cat in down pipe and straight through to the tail box

 

Still my car is so old it doesn't need a Cat hahahahahaha

 

is ther a cat on turbo up pipe???

 

I was once stopped by Vosa for a vehicle check, mine passed their emmisions test. I didnt have any cats on at the time.

Andy

 

What MY and spec..?

 

I'm handing myself in to the old bill tomorrow morning.

 

They would charge you with wasting police time ! "Missing cats in your down pipe, you want the fire service mate"

 

On 01 on UK cars (not STi's though AIUI) yes, before that, no! Other markets - not sure!

Simon

 

The construction and use laws when it comes to exhaust systems is so erroneous it is almost unenforceble (realistically speaking, as of yet the system is not anywhere near **** enough to go about doing what it preaches chapter and verse in its books of rules,regs and red tape from Brussels). If it were the case, any post' 92 EU market car with a cheapo kwick-fit aftermarket exhaust system would be illegal.

Next thing I'll hear is my car will be impounded for not having "E" approved bulbs fitted in the side lights.