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Decatting a Diesel

You CAN remove the catalytic converter on your Diesel Car without having a problem with the MOT. Having taken advice from VOSA, who control MOT testing in the UK, we are 100% confident that removing the CAT on a Diesel won't cause an issue. The confusion has arisen due to the regulations changing in January 2012 for cars which qualify for a full gas emissions test where 'if a cat was fitted as standard, it must be there for the MOT'. As Diesel cars don't qualify for a full gas emissions test, the regulation doesn't apply. The same is true for DPFs which you can also remove (they're not even mentioned in the manual)

Anyone can download the MOT testers manual HERE (you'll want the one for Class 3, 4, 5 and 7) and have a look. The part that deals with exhausts is Part 7.1 on page 157 (yes we've looked at this a lot!)

Obviously things can change but two inspectors from VOSA have both given the same information and said that nothing is going to change in the near future. If things do change then we'll be the first to let you know.

Information correct as of April 2012

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Sports, performance and modified

With over 30 years of experience in the industry, Longlife should be your first and only port of call when you want to get the maximum power from your car by upgrading or replacing your existing exhaust system. Our fully trained and experienced staff are able to talk to you in as much detail as you need to ensure you get exactly the exhaust system that you have in mind.

Our unrivalled range of over 1400 silencer combinations, designed to be free flowing for maximum power, are going to give your car the added power you are looking for.

In order to be able to back up our claims, we teamed up with Redline Magazine to build an exhaust on their Impreza STi. The car was benchmark tested on a rolling road with the standard exhaust system and produced 317bhp and 361 lb/ft of torque. With our custom made 3" cat back Longlife system, the car produced an impressive 350bhp and 364 lb/ft of torque - 33bhp up from standard.