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Author Topic: Removing Pre-cat  (Read 2361 times)

Offline Black9

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Removing Pre-cat
« on: May 29, 2012, 01:03:25 am »
So read a post on here about a member who removed his pre-cat on his gti with stock exhaust.
How Wld I go About doing the same? Is the pre-cat located just after the Downpipe? Is there a sensor in it and if so where would I move the sensor to!?

Can I expect this to free up the revs a bit and add a bit more exhaust noise? Talk to me  :happy2:

Offline badbwoy27

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Re: Removing Pre-cat
« Reply #1 on: May 29, 2012, 03:54:41 am »
I've got pre cat delete on my powerflow cat back system.expect more noise and also more power if custom remapping.do a search as this topic has been mentioned a few times. On ko3 golf,stage 1 Rtech map,pre cat delete and itg intake managed 256 bhp and near to 300 torques on there rolling road.next up for me is sports cat. :evilgrin:

Offline sideshowfred

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Re: Removing Pre-cat
« Reply #2 on: May 29, 2012, 09:00:15 am »
I did this a week and a half ago and it feels like it pulls harder at higher revs. The precat is before the bend in the downpipe. It took me and a mate about 3 hours all in. Exhaust noise is a little bit more but mostly I hear more turbo. And very loud pops from the exhaust when I change gear within the first few mins of driving. But that depends what rpm you change at.   

Offline GrayMK5GTI

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Re: Removing Pre-cat
« Reply #3 on: May 29, 2012, 08:09:54 pm »
So read a post on here about a member who removed his pre-cat on his gti with stock exhaust.
How Wld I go About doing the same? Is the pre-cat located just after the Downpipe? Is there a sensor in it and if so where would I move the sensor to!?

Can I expect this to free up the revs a bit and add a bit more exhaust noise? Talk to me  :happy2:

Ah your saw my thread  :grin:

It's as simple as I mentioned, there are links to pictures on pg 2 IIRC. I got my local trusted garage to do it for me  :happy2:

Gray
NOW: 2015 Golf R DSG 5 Door, Lapiz Blue, 19s, Discover Nav, Reversing Camera
GONE:2007 Black GTI Edition 30 3dr

Offline Black9

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Re: Removing Pre-cat
« Reply #4 on: May 30, 2012, 11:57:10 am »
Will get round To this eventually :popcornsoda:

So many other parts I'm in the process of replacing :sad1:

Offline GTI-Ross

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Re: Removing Pre-cat
« Reply #5 on: December 01, 2012, 04:16:35 pm »
Me and a friend had a go at this today, started un-tightening the 1st bolt (one you can see from engine bay) felt real tight, we tried WD40 (left for 10mins) still felt tight.

so heated up with blow torch, got a few turn out of it but still was really tight, my mate said it feels like itmight snap....i have heard a few people mention this

Anyone have a link to get a replacement bolt and seal kit?....or just buy straight from VW

Thanks guys
MK6 GTI CSG | Revo Stage 2 | Revo Stage 2 Intake | VWR SubFrame Mount | VibraTechnics Upper Engine Mount | VibraTechnic Transmission Mount | SuperPro Anti Lift Kit | H&R ARB's | Bilstein B12 | TT Short Shifter |Mintex M1144 Race Pads | HEL Braided Lines |

MK5 GTI - DSG + Extras (Sold because DSG was Soooo Boring !!!)


Offline GrayMK5GTI

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Re: Removing Pre-cat
« Reply #6 on: December 01, 2012, 04:54:24 pm »
Bolt and gasket part numbers on my thread, in the general area, probs about page 2 or 3 by now  :happy2:
NOW: 2015 Golf R DSG 5 Door, Lapiz Blue, 19s, Discover Nav, Reversing Camera
GONE:2007 Black GTI Edition 30 3dr