Not clued up on exhausts and needing help

[Dave_d]

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

[Shoy1980]

Before you proceed please bare in mind that a decat will fail MOT

[Dave_d]

Yeah I know cheers shoy 

[ROH ECHT]

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 ↓

[Dave_d]

Sorry to sound simple, what is a transfer pipe  my cars had a map so it's had the eml erased according to a guy I took my car to rolling road.

[MIJ_JAGGER]

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

[ROH ECHT]

Sorry to sound simple, what is a transfer pipe  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. 

[Dave_d]

this is a picture of my stainless box into my standard downpipe

[MIJ_JAGGER]

It'll fit, just use the existing clamps

[Dave_d]

Cheers boss  I'll order it

[Dave_d]

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

[Cadders96]

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

[MIJ_JAGGER]

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?

[Dave_d]

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

[Dave_d]

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