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Ian78
PostPosted: Mon Jun 17, 2019 7:44 pm 
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Car Model: 9³ Aero 250bhp Maptun, Eibach
Son needs a new back box on his mk7 Fiesta 1.6TDCi.
Back box isn't that expensive but he was thinking about putting a straight pipe in.
It's not that loud with the back box removed as it has the Cat obviously and a fair size centre box.
Question is some people say it will improve performance with a straight pipe and others say it will be faster with the back box in place.
So any ideas, thanks.

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Paul Taylor
PostPosted: Mon Jun 17, 2019 8:34 pm 
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Car Model: Two 97 9000 Aero's 2.3T.
Its not going to add any performance on a little diesel.
And diesels sound awful with loud chav exhausts.

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filathome
PostPosted: Mon Jun 17, 2019 9:16 pm 
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Could save a bit of weight and will probably work out cheaper too. Go for it.

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scanditurbo
PostPosted: Tue Jun 18, 2019 10:06 am 
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leave it alone mr officer will take notice and thats never good when your young eh
i looked about 12 and had an xjs vert talking to coppers every day got so boring
yes its mine yes i payed for it yes its legal blah blah blah

do they still sell cherry bombs ian
my bro had them on his 3.0 capri no silencers at all just 2 cherry bombs he has a pony tail so that explains it all really
got it was loud and not fast my 1.9 309 gti pug could beat it by miles even on a straight road

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Quad_cam_turbo
PostPosted: Tue Jun 18, 2019 11:28 am 
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The best exhaust for a turbo'd lump is no exhaust. The rear box doesn't really restrict that much but any restriction removal will help the engine breathe. You'll probably hear a bit more turbo whistle and get a lower rumble.
Plod is unlikely to be too fussed if it's not massively louder than stock.

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McVities
PostPosted: Tue Jun 18, 2019 5:49 pm 
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Quad_cam_turbo wrote:
The best exhaust for a turbo'd lump is no exhaust. The rear box doesn't really restrict that much but any restriction removal will help the engine breathe. You'll probably hear a bit more turbo whistle and get a lower rumble.
Plod is unlikely to be too fussed if it's not massively louder than stock.


As there is a cat and probably dpf upstream they will be far more restrictive than a silencer box at the end of the system. As such removal is likely to make precious little difference in terms of performance or flow.

It's also likely to have naff all effect on noise.

Personally I would stick a new pattern part on. It's a mass produced Ford, it won't cost the earth.

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Ian78
PostPosted: Tue Jun 18, 2019 6:17 pm 
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Thanks folks,
Fil, his Uncle could have welded a straight pipe in.
Not been on here today but in the end he went for a new pattern back box as Rich has said.
Was £59, he cut the pipe at the back, it was one of them ones that faces down.
He trimmed that and fitted a nice tail pipe trim with twin pipes..it looks good.
Dave, I had a cherry bomb on my first car.
Quad / Paul, he drove it with the back box removed and it was a bit loud actually driving it so decided against that.

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Ian78
PostPosted: Tue Jun 18, 2019 7:43 pm 
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Image

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Quad_cam_turbo
PostPosted: Tue Jun 18, 2019 9:53 pm 
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Looks tidy that. Better than a straight pipe.

A straight pipe sends the sound behind the car at speed so although it is a bit noisier it is distinctly quieter than driving a car with no rear box.

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scanditurbo
PostPosted: Wed Jun 19, 2019 10:45 am 
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Dave, I had a cherry bomb on my first car.
i knew that already bud :D
nothing worse than a droopy down pipe they look so sad dont they look at a toyota iq exhaust poor sad tiny bore thing from the 1950s
hed fit a 4 exit in there loads of room left

i got a new back box for my sri cav from vaux i asked twice it was defffo gonna be a nice oval one like i has now
oh yeas twice deffo a nice oval shiny one yes
arrived and was rusty and a droopy down one usless main dealer then you are they refunded and i got a free tracking done

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Ian78
PostPosted: Wed Jun 19, 2019 4:45 pm 
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Car Model: 9³ Aero 250bhp Maptun, Eibach
Yo Quad cheers.

Dave, yes man, it's nice to see some pipe :)

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