All Things Mk5 > How to Guides / Troubleshooting
how to change cat back/back box on gttdi for a gti one (for twin tailpipe looks)
Mandy:
Have twin discrete tailpipes on my gt tdi, wanting to change cat back/ back box for a gti/ ed30 one so i can have the twin tailpipes coming out.
I have brought a gti rear valance already...
What is it that i need to change?? I dont know much at all, lol! Is it the cat back or back box? whats the difference!
Any help much appreciated, feel free to laugh at me too, i dont mind!
MattPoss:
I bought a Cat Back Milltek system for my GT-TDI. Got it from Awesome with a rear valance which came to £416 delivered.
You can get a Resonated or Non Resonated system, Resonated inculdes an extra silencer where the Non Resonated doesn't.
I think i've also read about people fitting the back box from a 170bhp TDI and using a reducer clamp. Have a search around, might be able to find something about this.
Matt
Howardvwgolf:
--- Quote from: mandy71185 on February 16, 2010, 04:58:36 pm ---Have twin discrete tailpipes on my gt tdi, wanting to change cat back/ back box for a gti/ ed30 one so i can have the twin tailpipes coming out.
I have brought a gti rear valance already...
What is it that i need to change?? I dont know much at all, lol! Is it the cat back or back box? whats the difference!
Any help much appreciated, feel free to laugh at me too, i dont mind!
--- End quote ---
take a look in the wanted section in the thread you started, found something on ebay you might be interested in
Mandy:
--- Quote from: MattPoss on February 16, 2010, 06:52:23 pm ---I bought a Cat Back Milltek system for my GT-TDI. Got it from Awesome with a rear valance which came to £416 delivered.
You can get a Resonated or Non Resonated system, Resonated inculdes an extra silencer where the Non Resonated doesn't.
I think i've also read about people fitting the back box from a 170bhp TDI and using a reducer clamp. Have a search around, might be able to find something about this.
Matt
--- End quote ---
Yes i think i read this somewhere too, on another forum. Did briefly look into a Milltek resonated cat back but about £400 like you said! I'll happily settle for a used gti exhaust or similar for under £100.
So did you go for resonated or non resonated? What's it like?
B3n:
To change to the twin exhaust easiest option is to get a 170 back box part no:v1k6253609bh for around £120.
You then need to cut your the pipe on exhaust that is currently on your car just before it reaches the back box you will see on the 170 back box where this needs to be done but leave a little extra on the pipe on the car to allow it to slide into the back box pipe. Then its a simple case of cutting 2 v shaped pieces out of the pipe on the 170 box slide this over the existing pipe add a little exhaust paste and clamp the pipe down onto the pipe on the car you dont need an adapter.
Im not the best at explaining things but anygood exhaust centre will no what to do its a 5 min job max.
Ill try and get some pics of mine up today.
This link may help
http://uk-mkivs.net/forums/t/171534.aspx?PageIndex=1
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