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Model specific boards => Golf mk4 => Topic started by: PeteGTI1990 on 20 January 2013, 16:59

Title: Decat/down pipe and straight through mid section with standard back box.
Post by: PeteGTI1990 on 20 January 2013, 16:59: I have recently won a 3" decat/down pipe with straight through mid section... I am going to be fitting it onto my standard back box.. Has anyone done this and does anyone have a video of how it will sound? Many thanks
Title: Re: Decat/down pipe and straight through mid section with standard back box.
Post by: dom on 20 January 2013, 17:13: Quote from: PeteGTI1990 on 20 January 2013, 16:59
I have recently won a 3" decat/down pipe with straight through mid section... I am going to be fitting it onto my standard back box.. Has anyone done this and does anyone have a video of how it will sound? Many thanks

Why bother with a 3" system if you're going to keep your standard back box?
Title: Re: Decat/down pipe and straight through mid section with standard back box.
Post by: PeteGTI1990 on 20 January 2013, 17:40: I want it looking oem no exhaust hanging out the back.. And until I get the money to get a discreet upgraded back box It will be connected to the standard back box.
Title: Re: Decat/down pipe and straight through mid section with standard back box.
Post by: dom on 20 January 2013, 17:54: Quote from: PeteGTI1990 on 20 January 2013, 17:40
I want it looking oem no exhaust hanging out the back.. And until I get the money to get a discreet upgraded back box It will be connected to the standard back box.

Fair enough, you won't see any performance gains until you ditch the standard back box though.

I've got a 3" turbo back fitted to mine, I had a 45 degree down-turned pipe welded on instead of the standard tail pipe. It's hidden nicely behind a diesel anniversary valance so you can't see it at all :wink:

(http://i790.photobucket.com/albums/yy183/codling1234/IMAG1163.jpg)
Title: Re: Decat/down pipe and straight through mid section with standard back box.
Post by: PeteGTI1990 on 20 January 2013, 18:44: Sounds like a good idea... I know I won't see any gains yet but I couldn't pass up the opportunity for buying it for 70 quid :).... Will hopefully get a backbox sorted soon its just finding 1.
Title: Re: Decat/down pipe and straight through mid section with standard back box.
Post by: PeteGTI1990 on 20 January 2013, 18:45: Do you have a video of how yours sounds at all?
Title: Re: Decat/down pipe and straight through mid section with standard back box.
Post by: dom on 20 January 2013, 18:46: Quote from: PeteGTI1990 on 20 January 2013, 18:45
Do you have a video of how yours sounds at all?

Yup.

First vid, acceleration up to about 80mph:

(http://i790.photobucket.com/albums/yy183/codling1234/th_VIDEO0092.jpg) (http://i790.photobucket.com/albums/yy183/codling1234/VIDEO0092.mp4)

Cruising at 70, up to 80 at the end:

(http://i790.photobucket.com/albums/yy183/codling1234/th_VIDEO0091.jpg) (http://i790.photobucket.com/albums/yy183/codling1234/VIDEO0091.mp4)

I'm going to put an extra silencer in where the cat should be to try and reduce the noise inside the cabin.
Title: Re: Decat/down pipe and straight through mid section with standard back box.
Post by: PeteGTI1990 on 20 January 2013, 19:00: Cheers mate sounds pretty good when the foot presses the go faster pedal :)
Title: Re: Decat/down pipe and straight through mid section with standard back box.
Post by: rio_gti on 20 January 2013, 19:12: Yours won't sound like the with a standard box on it..... It will sound a little raspier and deeper but nothing like that.

When I had mine on you wouldn't have known that I had decat and straight thru on idle and when full throttle it was subtle, and if anything I prob preferred it with a centre box :lipsrsealed:

(It wasn't 3" between cat and back box)
Title: Re: Decat/down pipe and straight through mid section with standard back box.
Post by: Toby on 20 January 2013, 21:39: I miss mine :cry:
Title: Re: Decat/down pipe and straight through mid section with standard back box.
Post by: rio_gti on 20 January 2013, 23:15: You still here toby?!!!

(I miss mine too!!!!)
Title: Re: Decat/down pipe and straight through mid section with standard back box.
Post by: Prawny on 22 January 2013, 12:37: I'd have to disagree with Dom in a big way I'm afraid.

I had my AUM mapped to st1 by R-tech, where it made 206bhp with just a forge DV and a jetex filter.

I fitted a 3'' downpipe and decat, leading into a tdi centre section (no silencer) with the standard backbox.

The car made 224bhp on the dyno after fitting the downpipe. The stock downpipe is SO restrictive it's unreal, there are fantastic gains to be had just be changing the downpipe.

Several R-tech tuned cars have made 230bhp with the standard backbox. A chap on SSS was running 360bhp through the standard backbox on his leon cupra!
Title: Re: Decat/down pipe and straight through mid section with standard back box.
Post by: PeteGTI1990 on 22 January 2013, 13:21: So its worth still using the original backbox then... Whats the sound difference like with just the standard backbox?
Title: Re: Decat/down pipe and straight through mid section with standard back box.
Post by: Prawny on 22 January 2013, 14:00: Yes well worth it.

Sound is OK to be fair, kind of makes a more raspy tone, and a funny wooshing ripping noise on boost. I kinda liked it!
Title: Re: Decat/down pipe and straight through mid section with standard back box.
Post by: PeteGTI1990 on 22 January 2013, 16:29: Mine has just turned up by courier today :)... So hopefully if the weather holds off i will be fitting at the weekend ')