MK5 Golf GTI

All Things Mk5 => Modifications & Technical Area => Performance Modifications => Topic started by: akbarirfan on November 19, 2013, 10:50:48 am

Title: MOT + Downpipe (De-cat)
Post by: akbarirfan on November 19, 2013, 10:50:48 am
Hi All,

How do you folks with a decat downpipe deal with MOT time? The car will fail on emissions so how do you get around this?

Thanks
Title: Re: MOT + Downpipe (De-cat)
Post by: edd666999 on November 19, 2013, 10:55:57 am
Either re fit a downpipe or make friends with the garage owners daughter.  :pomppomp:
Title: Re: MOT + Downpipe (De-cat)
Post by: xjay1337 on November 19, 2013, 11:13:44 am
Put probe up a ford fiestas exhaust pipe
job done.
Title: Re: MOT + Downpipe (De-cat)
Post by: akbarirfan on November 19, 2013, 01:19:28 pm
Not sure if such garages exist in Basingstoke though!!

I think swapping the pipes out would be a great hassle, even if it is just once a year...is it really that easy, jack the front of the car up, put it on axle stands and undo some bolts? They don't all look so easy to reach though..
Title: Re: MOT + Downpipe (De-cat)
Post by: edd666999 on November 19, 2013, 01:20:35 pm
People pay every year for them to be swapped.

I never went decat because it wasn't worth the hassle.
Title: Re: MOT + Downpipe (De-cat)
Post by: akbarirfan on November 19, 2013, 01:55:47 pm
How much do you think the swap over would cost?

I would guess a mechanic would charge 1 hours labour in total for both swaps, so you're looking at £70~, add that to the MOT fee and you'll be looking at £130 per year for an MOT (providing it does not fail)!!
Title: Re: MOT + Downpipe (De-cat)
Post by: xjay1337 on November 19, 2013, 02:19:20 pm
Takes an hour to swap, we did my precat delete (dropped whole exhaust) in about 45 minutes and I had a seized bolt (which snapped  :sad1:)
Title: Re: MOT + Downpipe (De-cat)
Post by: akbarirfan on November 19, 2013, 03:02:56 pm
Do you think it's a driveway job or could it be done with some axles and a basic set of spanners?

Snapped a bolt? You just don't know your own strength do you?! :jumping:

Thanks
Title: Re: MOT + Downpipe (De-cat)
Post by: jonnym on November 19, 2013, 03:03:42 pm
A friendly garage will pass it for you...just gotta find one!! You in Bassingstoke?

Mine went through on Friday, I may have had a de-cat...
Title: Re: MOT + Downpipe (De-cat)
Post by: xjay1337 on November 19, 2013, 03:28:37 pm
Do you think it's a driveway job or could it be done with some axles and a basic set of spanners?

Snapped a bolt? You just don't know your own strength do you?! :jumping:

Thanks

It was seized, got 3 studs now holding my DP onto my turbo looool.
Unfortunately it's in the most ball-achey location so to re-stud it would require the turbo to be dropped. And can't be bothered the sake of one bolt (tis fine with 3 at the mo, new gasket and some paste) and unless I replace with a newer K03s or a k04 I'm just going to leave it.

But yes you can do it on a driveway if you had to. Pain in the arse because of working along the length of the car but it's honestly just a case of undoing some bolts
Title: Re: MOT + Downpipe (De-cat)
Post by: akbarirfan on November 19, 2013, 04:32:20 pm
Yes jonnym am in Basingstoke.

The job itself looks so straightforward in theory! hmm hmm
Title: Re: MOT + Downpipe (De-cat)
Post by: flufgti on November 23, 2013, 08:44:30 pm
Just take it for mot mine went through with a decat no problem.
Title: Re: MOT + Downpipe (De-cat)
Post by: biffobear on November 24, 2013, 12:45:11 pm
Mine passed mot no bother with downpipe decat, but about 6 months later I started getting the emissions light on, I fitted the extended elbow to the second cat sensor and no longer get the light. The first cat is for cold starting so is not part of the mot
Title: Re: MOT + Downpipe (De-cat)
Post by: akbarirfan on November 24, 2013, 01:38:59 pm
Oh wow - I thought a decat meant definite MOT emissions failure!!

Is the GTi engine really that environmentally friendly?
Title: Re: MOT + Downpipe (De-cat)
Post by: EddieA on November 25, 2013, 05:18:16 pm
Mine passed earlier this month with a decat, that was because I am friends with te mot tester... And it's local to Basingstoke as I am in Andover. Surprisingly mine was only just over the emissions limit with the decat fitted.
Title: Re: MOT + Downpipe (De-cat)
Post by: akbarirfan on November 25, 2013, 05:24:14 pm
EddieA - can you PM some more details about the garage please? Is your friend the only MOT tester there?

Thanks
Title: Re: MOT + Downpipe (De-cat)
Post by: MK1Campaign on October 03, 2015, 11:46:56 am
Will the car pass an MOT emissions wise as long as the car has been mapped properly?
Title: Re: MOT + Downpipe (De-cat)
Post by: Dave(tm) on October 03, 2015, 12:36:35 pm
Can't we all just get defeat devices fitted? That's assuming we don't have them already  :evilgrin:

Dave
Title: Re: MOT + Downpipe (De-cat)
Post by: rich83 on October 03, 2015, 01:04:09 pm
Will the car pass an MOT emissions wise as long as the car has been mapped properly?


With a de-cat it will always fail.
Title: Re: MOT + Downpipe (De-cat)
Post by: Paradox1 on October 19, 2015, 04:42:08 pm
Mine passed earlier this month with a decat, that was because I am friends with te mot tester... And it's local to Basingstoke as I am in Andover. Surprisingly mine was only just over the emissions limit with the decat fitted.

Thats interesting

So by your post it seems these cars are quiet efficent as it is, and the cat doesnt have much work to do to reduce the emissions.

Oh right that might be that sensor that VW put in lol

Wasnt the sensor to cheat a test at idle or underload in neutral?