MK5 Golf GTI

All Things Mk5 => Mk5 General Area => Topic started by: Jayy26 on August 29, 2014, 02:42:59 am

Title: de catting standard exaust
Post by: Jayy26 on August 29, 2014, 02:42:59 am
Hi i was going to buy a standard gti downpipe etc and remove the cat to basically make a cheaper makeshift decat (Y) haha

anybody done this etc?

just wanting a little more noise and more freeflowing...

car has revo remap,,,,260-270bhp
miltek backbox...


cheers
Title: Re:
Post by: howie1987 on August 29, 2014, 02:54:32 am
You could remove the pre cat. I have a standard down pipe with pre cat removed forsale as of next week it will be in the forsale section with the cat.
Title: Re:
Post by: Stooey on August 29, 2014, 10:21:29 am
Quote from: howie1987 on August 29, 2014, 02:54:32 am
You could remove the pre cat. I have a standard down pipe with pre cat removed forsale as of next week it will be in the forsale section with the cat.

What difference to performance and noise does removing the pre cat make?
Title: Re:
Post by: Frenzy on August 29, 2014, 11:06:26 am
Quote from: Stooey on August 29, 2014, 10:21:29 am
Quote from: howie1987 on August 29, 2014, 02:54:32 am
You could remove the pre cat. I have a standard down pipe with pre cat removed forsale as of next week it will be in the forsale section with the cat.

What difference to performance and noise does removing the pre cat make?

Slightly deeper exhaust note and maybe 5bhp  :smiley:
Title: Re: de catting standard exaust
Post by: Jayy26 on October 18, 2014, 07:30:21 pm
i didnt see much off a difference tbh :/ but mine was already mapped and has milltek back box (Y)

as im on about noise etc..

Ive took my pre cat out and got a milltek back box..

has anybody got any clips off there different variations and exaust?

fancy a decat but dont want to be stupid noise..
Title: Re: de catting standard exaust
Post by: Wash on October 18, 2014, 08:09:57 pm
I have a 3" exhaust (no cats at all) all the way back to a non-resonated milltek backbox and I think it sounds amazing. When you're not on it, it sounds almost exactly like stock but perhaps a TINY bit louder from the inside but as soon as you start going into boost it makes an awesome roar.

I can probably make a video if you want showing what it's like?
Title: Re: de catting standard exaust
Post by: Dave(tm) on October 18, 2014, 08:15:47 pm
Quote from: Wash on October 18, 2014, 08:09:57 pm
I have a 3" exhaust (no cats at all) all the way back to a non-resonated milltek backbox and I think it sounds amazing. When you're not on it, it sounds almost exactly like stock but perhaps a TINY bit louder from the inside but as soon as you start going into boost it makes an awesome roar.

I can probably make a video if you want showing what it's like?

I'd be very interested in this if you found time :-)

Dave
Title: Re: de catting standard exaust
Post by: Wash on October 18, 2014, 08:18:59 pm
I'll make a video tomorrow then. I'll include bits showing what it's like driving around sensibly and what it sounds like when you put your foot on the loud pedal.  :happy2:
Title: Re: de catting standard exaust
Post by: grumpy on October 18, 2014, 08:32:29 pm
Hi mate,
I de-catted my standard downpipe and didn't notice any difference in noise whatsoever. I didn't remove the pre-cat though. Then I fitted a bcs de-cat downpipe (mated to standard cat-back) and now I love the sound.

Thanks.
Title: Re: de catting standard exaust
Post by: Jayy26 on October 18, 2014, 08:34:16 pm
sound clip would be awesome..

ill make one tonight just so people can tell the difference :)

is they any way off finding out if the back box is res or not?
Title: Re: de catting standard exaust
Post by: Wash on October 19, 2014, 09:33:18 pm
Not really the best videos and the sound does absolutely no justice to what the car sounds like in real life but might be useful anyway...

First video shot from inside, when I'm not putting my foot down the car is pretty much the same as stock...
NkuOw

Videos from outside...

NkuOw&index=2
NkuOw


Probably worth mentioning my car also has an Audi S3 engine with a cold air intake and a stage 2 map from r-tech... lol
Title: Re: de catting standard exaust
Post by: gerbil on October 19, 2014, 11:06:56 pm
I have a eurojet decat mated to a standard cat back on my ED30... It makes slightly more noise but nothing over the top. Most noticeable on tickover while cold.
Title: Re: de catting standard exaust
Post by: ED30GTI on October 22, 2014, 08:35:46 am
Quote from: Wash on October 18, 2014, 08:09:57 pm
I have a 3" exhaust (no cats at all) all the way back to a non-resonated milltek backbox and I think it sounds amazing. When you're not on it, it sounds almost exactly like stock but perhaps a TINY bit louder from the inside but as soon as you start going into boost it makes an awesome roar.

I'd agree with this , as I've got a full decat system with non res miltek , and just driving round normal it's not loud at all , it's a deeper tone than stock but not loud , but when on it , it sounds mint :)
Title: Re: de catting standard exaust
Post by: GrayMK5GTI on October 22, 2014, 12:34:34 pm
I'm about to get a downpipe & 200CEL sports cat to mate to my OEM system  :happy2:

More info on pre-cat removal: http://www.mk5golfgti.co.uk/forum/index.php?topic=41083.0
Title: Re: de catting standard exaust
Post by: mvb12 on October 22, 2014, 01:13:05 pm
I have a zoorst up for grabs if someone wants to smash that up.

http://www.mk5golfgti.co.uk/forum/index.php/topic,90075.0.html

 :ashamed:
Title: Re: de catting standard exaust
Post by: Georrge on October 22, 2014, 03:45:44 pm
Quote from: Wash on October 18, 2014, 08:09:57 pm
I have a 3" exhaust (no cats at all) all the way back to a non-resonated milltek backbox and I think it sounds amazing. When you're not on it, it sounds almost exactly like stock but perhaps a TINY bit louder from the inside but as soon as you start going into boost it makes an awesome roar.

I can probably make a video if you want showing what it's like?
How much did that all cost, just watched your videos and it sounds incredible! Also what intake do you have?