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the exhaust section may raise a few eyebrows here. as many inc me have the secondry cat changed but still easily pass emisions test...
 
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I'm not saying "do this instead";)

But.... A fake cat (straight through pipe surounded by a cat like silencer) Can not be checked for effective operation:thumbs: Expect Ebay to be bursting at the seams with them really soon!

As long as your emissions are ok and no warning light shows, you'll be fine...
DOT/ VOSA are innundated with phone calls about the new regs from testing stations at the moment seeking clarification. The general opinion is to leave it up to the "descretion of the examiner if they deem a cat has been replaced with a straight pipe... In other words.... Some will fail, some will not depending on the experience of the examiner to know the difference...

Cats will be a VISUAL CHECK ONLY

We aren't even allowed to give it a thump test! :thumbs:
Hope this lays any fears to rest
Here is an example:
http://www.ebay.co.uk/itm/ALFA-ROMEO-156-97-04-Decat-Cat-Bypass-/160682242887?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item2569687347

Expect a lot more models to appear quickly and of course the quality and price will vary

Here is an example
 
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