MK5 Golf GTI

All Things Mk5 => Mk5 General Area => Topic started by: Dave_d on August 15, 2017, 05:55:03 pm

Title: Not clued up on exhausts and needing help
Post by: Dave_d on August 15, 2017, 05:55:03 pm
Hi guys, I took my car to the garage earlier to get a mechanic to check over the exhaust as it sounds like a tractor! It turns out the flexi in my downpipe is blowing very badly, so will need to be replaced.

Currently it has a standard downpipe and cats which then go into a  3"stainless cobra exhaust, I've decided I'm going down the de cat route so I need a decat pipe to replace my current. I've found this but I'm unsure if it will fit? Wil it need adaptors or anything?
https://www.ebay.co.uk/itm/162590892180

Really appreciate any help you can give me. Need to get it sorted asap as my car sounds awful

Dave
Title: Re: Not clued up on exhausts and needing help
Post by: Shoy1980 on August 15, 2017, 06:27:39 pm
Before you proceed please bare in mind that a decat will fail MOT
Title: Re: Not clued up on exhausts and needing help
Post by: Dave_d on August 15, 2017, 07:18:35 pm
Yeah I know cheers shoy  :happy2:
Title: Re: Not clued up on exhausts and needing help
Post by: ROH ECHT on August 15, 2017, 07:34:07 pm
It looks to fit a MK5 gti, but you won't need the transfer pipe they give you. It looks to be for running the oem stock exhaust as it goes from their DP diameter to a smaller bit. So, in addition to that DP you'll need a section to connect the DP to your exhaust. You may want an 90° angled O2 spacer. I am catless as well and my CEL was always on until I installed one. Got one off ebay for $15usd.[ https://www.google.com/search?q=angled+o2+spacer&source=lnms&tbm=shop&sa=X&ved=0ahUKEwiDxJum79nVAhVKVWMKHRirD_EQ_AUICigB&biw=1173&bih=529 ] Aim it so the O2 is upstream and slightly elevated North of horizontal...mine ↓
(https://farm5.staticflickr.com/4140/35318013910_d991fe7937.jpg) (https://flic.kr/p/VNW45j)
Title: Re: Not clued up on exhausts and needing help
Post by: Dave_d on August 15, 2017, 07:49:03 pm
Sorry to sound simple, what is a transfer pipe  :confused: my cars had a map so it's had the eml erased according to a guy I took my car to rolling road.
Title: Re: Not clued up on exhausts and needing help
Post by: MIJ_JAGGER on August 15, 2017, 11:20:34 pm
Should do, as your cobra catback is already mated to the standard downpipe. Get a pic up of the cobra and can tell you if it'll defo fit
Title: Re: Not clued up on exhausts and needing help
Post by: ROH ECHT on August 16, 2017, 09:37:35 am
Sorry to sound simple, what is a transfer pipe  :confused: my cars had a map so it's had the eml erased according to a guy I took my car to rolling road.
It is the second pipe in the pic of the DP in question you gave the link to... and it is just a nearly straight section reduced at one end for oem sized exhaust fitment...goes between the DP and catback. Why i said won't need it due to your existing 3" catback. Probably need that section made to fit what you got. Likely can be stretched back out to 3" and add a v-band or whatever is at the upstream end of your 3" catback.

Great, no need for the O2 spacer then.  :drinking:
Title: Re: Not clued up on exhausts and needing help
Post by: Dave_d on August 16, 2017, 12:27:19 pm
(https://preview.ibb.co/mSZLpv/IMG_5326.jpg)this is a picture of my stainless box into my standard downpipe
Title: Re: Not clued up on exhausts and needing help
Post by: MIJ_JAGGER on August 16, 2017, 01:02:57 pm
It'll fit, just use the existing clamps
Title: Re: Not clued up on exhausts and needing help
Post by: Dave_d on August 16, 2017, 01:12:02 pm
Cheers boss  :happy2: I'll order it
Title: Re: Not clued up on exhausts and needing help
Post by: Dave_d on August 16, 2017, 02:51:10 pm
Ordered it, will be delivered Friday, will be fitted Monday with abit of luck. Will let you all know how I get on. Thanks fir all your help
Title: Re: Not clued up on exhausts and needing help
Post by: Cadders96 on August 16, 2017, 03:18:23 pm
Ordered it, will be delivered Friday, will be fitted Monday with abit of luck. Will let you all know how I get on. Thanks fir all your help
Put some pics of it on here and any modifications required for it to fit to the 3" catback system as I am looking to do this
Title: Not clued up on exhausts and needing help
Post by: MIJ_JAGGER on August 16, 2017, 03:28:13 pm
I'm guessing there's probably a reducer on the catback to mate up to the oem downpipe.

So technically after fitting the new dp, it'll now be 3" reduced to 2.5" then back to 3"

Decat will make it loud, should sound good.
Does the catback have a resonator and muffler?
Title: Re: Not clued up on exhausts and needing help
Post by: Dave_d on August 16, 2017, 05:35:59 pm
I've got no idea! As I say I'm not clued up on exhausts. I'll post some pics of underside of exhaust. Maybe you will be able to tell
Title: Re: Not clued up on exhausts and needing help
Post by: Dave_d on August 16, 2017, 05:45:56 pm
I'd hazard a guess on it being non resonated. I've done a video on a view of the exhaust. Maybe you can tell from the video?

https://youtu.be/cWPiv9Df76k (https://youtu.be/cWPiv9Df76k)
Title: Re: Not clued up on exhausts and needing help
Post by: Dave_d on August 16, 2017, 05:48:54 pm
(https://preview.ibb.co/hFMsma/IMG_5362.jpg) (https://ibb.co/gikJRa)
(https://preview.ibb.co/fdwQ6a/IMG_5363.jpg) (https://ibb.co/cfTGCF)
(https://preview.ibb.co/kexbCF/IMG_5364.jpg) (https://ibb.co/mKF7Kv)
Title: Re: Not clued up on exhausts and needing help
Post by: MIJ_JAGGER on August 16, 2017, 07:20:09 pm
Yeah non resonated, will be loud.
Having a look at the video, im trying to figure out what clamps have been used to mate it together...
You might need a 2.5" exhaust sleeve/clamp, same as the one that comes with the oem exhaust...
Are you fitting it yourself?
Title: Re: Not clued up on exhausts and needing help
Post by: Dave_d on August 16, 2017, 07:55:14 pm
Worried it'll be too loud now  :scared:
My local mechanic is going to be fitting it for me, he'll sort out future MOT's for me too.
I must admit she sounds sublime on wide open throttle.
I'll get him to offer it up when it comes, to then see what adaptors I may need. Hopefully nothing

Title: Re: Not clued up on exhausts and needing help
Post by: ROH ECHT on August 16, 2017, 11:15:57 pm
Not too loud...mine is decat w/o resonator and just a small Borla...



...and this one is some normal driving sounds...
Title: Re: Not clued up on exhausts and needing help
Post by: Dave_d on August 20, 2017, 09:11:54 am
(https://preview.ibb.co/evMFSQ/IMG_5399.jpg)
Title: Re: Not clued up on exhausts and needing help
Post by: Dave_d on August 20, 2017, 09:12:34 am
She's arrived.
Title: Re: Not clued up on exhausts and needing help
Post by: Rigsby on August 20, 2017, 09:18:46 am
Is that the eBay downpipe?
I'll be getting this at the end of the month, if you could let us knis what it's like once fitted.

On another note, how is everyone attaching pics now?
I've tried Flickr and imgur apps in phone but can't get it to work?
Title: Re: Not clued up on exhausts and needing help
Post by: Dave_d on August 20, 2017, 09:23:36 am
Yeah it is @Rigsby (http://www.mk5golfgti.co.uk/forum/index.php?action=profile;u=11668)  its hopefully going on on Wednesday as my mechanic is busy, I just searched on google for upload image and imgbb.com popped up, uploads in seconds then I use a cut and paste in between the img][/img] to get the forum to show the image
Title: Re: Not clued up on exhausts and needing help
Post by: willni on August 20, 2017, 09:32:50 am
Is that the eBay downpipe?
I'll be getting this at the end of the month, if you could let us knis what it's like once fitted.

On another note, how is everyone attaching pics now?
I've tried Flickr and imgur apps in phone but can't get it to work?

I use Tapatalk now on the phone you just write you're post and click add picture and it hosts it for you.
Title: Re: Not clued up on exhausts and needing help
Post by: Rigsby on August 20, 2017, 10:09:48 am
@Dave_d (http://www.mk5golfgti.co.uk/forum/index.php?action=profile;u=19690) @willni (http://www.mk5golfgti.co.uk/forum/index.php?action=profile;u=18056)
Just tried imgbb and worked a treat.
But will try tapatalk aswell
Cheers
Title: Re: Not clued up on exhausts and needing help
Post by: Dave_d on August 20, 2017, 10:23:38 am
I've made a new video showing my downpipe section going into my cobra exhaust. It looks to me like the cobra exhaust has the pipe that flows down to 2 1/4 to join the standard downpipe. The de cat I bought is 3" then end section is 2 1/4 so in theory it should be just a straight swap and no sleeves are needed? Excuse my ignorance as I really am not clued up on exhaust one little bit.

Here's the video
https://youtu.be/l18t3m14O-E (https://youtu.be/l18t3m14O-E)
Title: Re: Not clued up on exhausts and needing help
Post by: Dave_d on August 20, 2017, 10:31:08 am
Also may I add I'm attempting to measure the width of the pipe lying on floor with arm stretched :grin:
Title: Re: Not clued up on exhausts and needing help
Post by: Rigsby on August 20, 2017, 01:21:25 pm
If your cobra joins to standard down pipe, and the decat downpipe is designed to fit to oem cat back then it should fit fine mate
Title: Re: Not clued up on exhausts and needing help
Post by: Dave_d on August 23, 2017, 06:08:15 pm
Hi guys, so.. the decat  downpipe has been fitted! She sounds sensational on WOT  :driver:
My mechanic struggled to fit this to my cobra cat back, the clamp that was supplied with it was far too small, the hangers are out of line with the holes so he had to weld my old ones onto the side of them to get it located. 2 Of the 4 bolts sheered off so he had to weld nuts on to get them out.
Would I recommend it? Yes if you are fitting yourself and have access to welding gear or your mechanic does, my car sounds lovely now, a very nice deep roar from my exhaust now, people say that de cats drone on motorways, however I drove at 60mph for a few miles and noticed no drone? It's loud, but then remember I'm now decat and also have non resonated cobra cat back. I might swap out the cobra in the future to a resonated version, I'll see how I get on anyway..

Dave
Title: Re: Not clued up on exhausts and needing help
Post by: Rigsby on August 23, 2017, 09:29:33 pm
@Dave_d (http://www.mk5golfgti.co.uk/forum/index.php?action=profile;u=19690)

Sounds a nightmare.
You say The hangers on the downpipe were wrong?
Title: Re: Not clued up on exhausts and needing help
Post by: Dave_d on August 23, 2017, 09:48:40 pm
Yeah that's correct. As the pipe has many slight curves in it I don't think the flexi has been welded in the "correct rotation" as it seemed to me that if it was rotated around just slightly more it'd have lined up ok. The welding looked spot on though. As I work with welders everyday you get an idea of a good / bad weld. Quite possibly I just had someone who wasn't concentrating when they welded I it together. Just my luck though for 2 bolts to sheer off on my original downpipe.
Title: Re: Not clued up on exhausts and needing help
Post by: Rigsby on August 29, 2017, 07:10:11 pm
Was this the downpipe for £118 on eBay ? Sold by Fast bits?
Thus is what I got and thought I'd test fit the pipes together and the v clamp doesn't  fit?? Bad start
Title: Re: Not clued up on exhausts and needing help
Post by: Dave_d on August 29, 2017, 09:00:23 pm
Mine was 118.99, sold by seller "fastlanestyling-Europe2012". Yeah my clamp didn't fit either. Far to small.  For the money though I'm very happy with it, certainly gave me a it more oomph and turbo spools up quicker, smells nice too. Hehe :driver: