All Things Mk5 > Performance Modifications
Running a decat
Weston:
--- Quote from: nams1 on March 07, 2012, 10:38:02 am ---Whats the difference between a large bore downpipe and decat?
--- End quote ---
A large bore down pipe will be wider than standard, 3" v. 2.75" I believe. A decat means the cat material from within the DP has been removed so essentially it's just an empty pipe. Both allow greater flow through the exhaust.
pd9264:
i put a decat on my gti and my eml hasnt come on, iv done about 500 miles. also iv got an extension piece on my second lamda sensor. its got a little hole in the bottom where it enters the exhaust. it stops the sensor picking up too much exhaust gas so it doesnt relise its got a decat. its only a cheap toyosport decat though.
nezquick:
Just a quick question, I have a decat downpipe (3") mated to a resonated milly, the check light came on but cleared with vagcom - I am expecting it to come back within the 100 miles again. Is this potentially a MOT failure recipe? I love the sound of mine, really nice and quite when you want it to be and then when you give it some boot it sounds :drool:
Tamiyoman:
No CAT= MOT FAIL, light on or otherwise :happy2:
nezquick:
:happy2: thought as much, thats alright I have a friend in the business so im sure he can help :innocent:
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