Exhaust Experts

Author
Discussion

Petrolsmasher

Original Poster:

1,832 posts

55 months

Friday 15th March
quotequote all
Anyone got any previous experience or advice they could offer me. Engine in question is a 4 pot turbo - i know it will never sound good it just needs a bit more volume though as it is too quiet.

Currently got a branded system on which i could maybe sell second hand for 175/200.

another system will be about 600 including fitting so would cost me about 400.

Im hoping to maybe make the current system louder and not go through the hassle of trying to sell it.

Currenr system is 2.75 inch straight through from the standard cat to the backbox - backbox seems to supress a lot of noise as like i say its a pretty quiet system. Would removing the rear backbox be too loud even leaving the standard cat in place?

Or is it a viable option to keep all the pipework and swap out the backbox for a less baffled backbox?

My main concern is ending up with loads of resonance as it currently only has the backbox as the resonator. Would it make more to straight pipe the backbox and fit a resonator in the middle pipework?


Rtig

120 posts

64 months

Friday 15th March
quotequote all
What car is it? Chances are unless it's something really obscure there will be plenty of videos on YouTube with various exhaust systems to compare noise.
Any good exhaust place will be able to change the back box for you.

Weekendrebuild

153 posts

2 months

Friday 15th March
quotequote all
Just get rear back box deleted shouldn’t cost more than £80

Chris32345

10 posts

1 month

Friday 15th March
quotequote all
Personally I wouldn't for two reasons
One you look an sound like a **** driving around
And 2 it should fail a mot for being louder then factory

ging84

5,407 posts

85 months

Friday 15th March
quotequote all
maybe try drilling a hole in your windows and/or skull to let more noise in
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addz86

1,106 posts

125 months

Friday 15th March
quotequote all
What car is it? Some 4 pots sound decent with a louder exhaust, others just sound crap regardless.

DaveH23

2,415 posts

109 months

Friday 15th March
quotequote all
Petrolsmasher said:
it is too quiet.
I wonder if there is a reason for that?

Petrolsmasher said:
i know it will never sound good.
and here we have the answer.

I'm not being arse as I also drive a 4 pot.

DoubleD

7,249 posts

47 months

Friday 15th March
quotequote all
Chris32345 said:
And 2 it should fail a mot for being louder then factory
Are you sure about that?

Weekendrebuild

153 posts

2 months

Friday 15th March
quotequote all
Totally wrong it won’t fail an MOT

Digby

6,866 posts

185 months

Friday 15th March
quotequote all
One would assume those saying keep it quiet, also hate the sound of Spitfires and Lambo's...

ecsrobin

9,594 posts

104 months

Friday 15th March
quotequote all
addz86 said:
What car is it? Some 4 pots sound decent with a louder exhaust, others just sound crap regardless.
I put my money on a mk7 Fiesta ST.

AlexRS2782

5,258 posts

152 months

Saturday 16th March
quotequote all
ecsrobin said:
addz86 said:
What car is it? Some 4 pots sound decent with a louder exhaust, others just sound crap regardless.
I put my money on a mk7 Fiesta ST.
Yep (quoted from a recent thread):

Petrolsmasher said:
I have a really strong urge to sell my mk7 fiesta st...
Edited by AlexRS2782 on Saturday 16th March 01:12

speedking31

2,505 posts

75 months

Saturday 16th March
quotequote all
Someone like Powerflow should be able to provide a suitable backbox within budget.

KungFuPanda

3,089 posts

109 months

Saturday 16th March
quotequote all
Digby said:
One would assume those saying keep it quiet, also hate the sound of Spitfires and Lambo's...
I'd rather listen to a factory Lambo with a standard exhaust than a four pot engine that has been fitted with an exhaust that's been fettled twice by two different garages.

paintman

5,041 posts

129 months

Saturday 16th March
quotequote all
Weekendrebuild said:
Totally wrong it won’t fail an MOT
"You must use your judgement to assess exhaust noise:

during the emissions test for the vehicle
rev the engine to around 2,500rpm or half the maximum engine speed if this is lower on vehicles not subject to an emissions test
Exhaust noise from the vehicle must not be unreasonably above the noise level you'd expect from a similar vehicle with a standard silencer in average condition.
DEFECT Exhaust noise levels in excess of those permitted
CATEGORY Major"
www.mot-testing.service.gov.uk/documents/manuals/c...

dme123

4,530 posts

128 months

Saturday 16th March
quotequote all
It can't be too quite, up to the point that it is silent. Farting four pot hatchbacks with noisy exhausts are what give motoring enthusiasts a bad name hehe

DoubleD

7,249 posts

47 months

Saturday 16th March
quotequote all
dme123 said:
It can't be too quite, up to the point that it is silent. Farting four pot hatchbacks with noisy exhausts are what give motoring enthusiasts a bad name hehe
Idiot drivers give us enthusiasts/nerds/geeks/car bores a bad name. The actual car doesnt.

nobrakes

1,004 posts

137 months

Saturday 16th March
quotequote all
Young Luke, sounds like you already have a nice quick car.

£170 for your old exhaust? More like a tenner if you’re lucky.

You’d be better spunking your £600 quid on women.

WJNB

1,522 posts

100 months

Saturday 16th March
quotequote all
paintman said:
Exhaust noise from the vehicle must not be unreasonably above the noise level you'd expect from a similar vehicle with a standard silencer in
How pathetic as this relies on the judgement of a tester who could be hard of hearing or has very sensitive ears & bias against any form of exhaust modification intended to be louder than standard.

WJNB

1,522 posts

100 months

Saturday 16th March
quotequote all
Actually I used to like a sport noisy exhaust but now that I've grown up I prefer the quieter approach as I don't need to show-off or draw attention to myself or my car however lovely it might be.