MK5 Golf GTI

All Things Mk5 => Mk5 General Area => Topic started by: Homer on September 12, 2013, 06:21:39 pm

Title: Does a downpipe require a sports cat or decat?
Post by: Homer on September 12, 2013, 06:21:39 pm

The reason I ask is that I asked a garage to quote me on how much they wanted to fit one- they have come back saying do I want one with a sports cat or de-cat. I thought a downpipe would be a swap and the rest of the exhaust would remain the same, am I missing something? Thanks for any advice

Title: Re: Does a downpipe require a sports cat or decat?
Post by: MC71 on September 12, 2013, 06:24:56 pm

Cat is part of the downpipe.  :happy2:

Title: Re: Does a downpipe require a sports cat or decat?
Post by: Scottymon on September 12, 2013, 06:51:03 pm

Yeah, the downpipe on these consists of a Pre-cat > Flexi > 800 cell (iirc) main cat >
A picture speaks a thousand words, so:

(https://www.mk5golfgti.co.uk/forum/proxy.php?request=http%3A%2F%2Fdaz.co%2Fmedia%2Fpeter0976%2FOctavia_vRS%2FP1050722-Copy.jpg&hash=89cad05facb0ad0b3c1f5b22944f9241da949939)

Title: Re: Does a downpipe require a sports cat or decat?
Post by: Homer on September 12, 2013, 07:57:53 pm

So what would the difference be between a sports cat and de-cat?

Title: Re: Does a downpipe require a sports cat or decat?
Post by: Janner_Sy on September 12, 2013, 08:00:17 pm

A Performance downpipe essentially removes the pre cat from the downpipe completely and replaces the stock restrictive CAT with  performance CAT .  This is still rod legal and MOT proven.

A Decat downpipe removes ALL CATs from the downpipe completely.  This is not road legal nor is it MOT ready.

Title: Re: Does a downpipe require a sports cat or decat?
Post by: Homer on September 12, 2013, 08:14:07 pm

So how do people get away with a decat during MOT time?

Title: Re: Does a downpipe require a sports cat or decat?
Post by: MC71 on September 12, 2013, 08:30:04 pm

You don't, put your cat downpipe back on for the MOT, PITA.