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Author Topic: exhaust boxes??  (Read 1648 times)

Offline BlazinGTI

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exhaust boxes??
« on: 14 July 2009, 13:37 »
Probably a real thick question here lads, but my gti exhaust has 3 boxes, Cat, middle box and back box.

The car had a dtm styleee stainless steal back box on it when i bought it,  but i wouldnt mind it to sound a bit grunty, at the momment its no different to standard. if i removed the middle box for straight through would it make any difference and would it drop the back pressure causing performance to drop off?? also i take it its not needed for MOT?

only reason i ask is i have seen a few full systems on fleebay and neither have middle boxes!

cheers
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Offline ace

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Re: exhaust boxes??
« Reply #1 on: 14 July 2009, 14:00 »
u will definately hear the difference if u remove the middle box!!!!!!

u dnt need it for mot either
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Offline Wayne

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Re: exhaust boxes??
« Reply #2 on: 14 July 2009, 14:11 »
You could leave the middle box but remove the front silencer, that would also make a difference.
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Offline BlazinGTI

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Re: exhaust boxes??
« Reply #3 on: 14 July 2009, 14:13 »
front silencer as in the CAT???
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Offline Wayne

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Re: exhaust boxes??
« Reply #4 on: 14 July 2009, 14:16 »
Quote from: BlazinGTI on 14 July 2009, 14:13
front silencer as in the CAT???

No the one after.
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Offline christomk3gti

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Re: exhaust boxes??
« Reply #5 on: 14 July 2009, 14:26 »
dont worry bout the back pressure, if anything, a slight increase in power will be gained, not much tho, but still, a better breathing engine is what u want. I'm gettin a cat back system soon, by the end of this week I am hoping anyway. Would love a Full System but are toooooooo expensive  :grin:
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Black 8v GTI............. Whats a Waffle Valve?

Offline BlazinGTI

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Re: exhaust boxes??
« Reply #6 on: 14 July 2009, 15:05 »
Quote from: christomk3gti on 14 July 2009, 14:26
dont worry bout the back pressure, if anything, a slight increase in power will be gained, not much tho, but still, a better breathing engine is what u want. I'm gettin a cat back system soon, by the end of this week I am hoping anyway. Would love a Full System but are toooooooo expensive  :grin:

what system are you getting dude? ive been looking to and way over my budget, hence why im thinking of making my own.

so has anyone here actually removed the middle box??
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ianw3321

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Re: exhaust boxes??
« Reply #7 on: 14 July 2009, 15:12 »
I would love to remove the middle box as it goes in at one side and comes out diagonally opposite, hardly straight through. Think I will wait till after mot though.
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Offline DigiDub

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Re: exhaust boxes??
« Reply #8 on: 14 July 2009, 18:39 »
When my middle silencer's baffle went south for the winter i decided to replace it with a straight through piece from the cat & at the same time i got a Stainless Steel back box fitted which I had anyway cos the rear box was rotten and got them both sorted at the same time thus saving notes!

Not bad all for £180 notes, especially as the bloke who did it increased the bore size of the exhaust.  :wink:

With all of this done the car now barks, growls and pops (on down shift) and all got through the MOT fine.  :smiley:
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Offline christomk3gti

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Re: exhaust boxes??
« Reply #9 on: 14 July 2009, 19:35 »
powerflow maybe..

If not.... then jetex maybe..... not 100% sure, all depends on this powerflow i may be getting.
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Black 8v GTI............. Whats a Waffle Valve?
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