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mystery machine

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mystery machine

mystery machine

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Posted (edited)

Hi folks,

I plan to replace my exhaust from the turbo back, prior to ECU remapping. I've more-or-less decided on a Cobrasport decat downpipe and resonated centre section, just not too sure what to do about a back box... :unsure:

Actually pretty happy with the quiet standard STI box that's on the car at the mo', but it's looking a bit rusty around the edges, so this would seem like a good time to replace it with a nice shiny stainless steel item :)

I've ruled out the Cobrasport BB after listening to the clips on their site – too loud and ratty for me. Had a listen to some YouTube vids of other backboxes and actually the Prodrive is probably about as loud as I'd want to go! :o

Can anyone suggest where I might source a Prodrive backbox, or recommend an (as quiet) alternative?

Many thanks again :occasion14:

Edited by Mystery Machine
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Spaceman

Spaceman

Posted
Posted

a 2.5 bb will bolt on to a 3 inch centre but its really pointless as it will just be a choke point bud

i felt that the prodrive box was really restictive when i took a afterburner vortex off mine.

if i was you bud id take a look at hayward and scott or tsl H&S do a prodrive style BB in 3" pipe im sure and tsl do a similar one in 3" sure its called Group n bb

iv had the group n tsl jobbie and it was really nice looking and not loud at all just a nice burble with a bit of a bark flat out crusing around it was same as prodrive noise level wise.

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Spaceman

Spaceman

Posted
Posted

group n tsl job might only be in 2.5 inch bore

http://www.tsl-motorsport.co.uk/newsite/products.php?nav=300000&section=300008&detail=35

yea had and look and it must have been the H&S rear box i had this one

http://www.haywardandscott.com/subaru/impreza-new-age/subaru-new-age-3-backbox.html

i got mine off ebay in as new condition for bout £80 keep an eye on there bud or in scoobynet for sale general.

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mystery machine

mystery machine

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  • Author
Posted (edited)

a 2.5 bb will bolt on to a 3 inch centre but its really pointless as it will just be a choke point bud

i felt that the prodrive box was really restictive when i took a afterburner vortex off mine.

if i was you bud id take a look at hayward and scott or tsl H&S do a prodrive style BB in 3" pipe im sure and tsl do a similar one in 3" sure its called Group n bb

iv had the group n tsl jobbie and it was really nice looking and not loud at all just a nice burble with a bit of a bark flat out crusing around it was same as prodrive noise level wise.

Cheers mate.

I thought that the 2.5" bore only became restrictive when pushing above 350bhp (or 400bhp according to some sources)? I'm shooting for 320-340ish.

TBH, I was leaning towards 2.5" all the way through as that's supposed to produce less cabin noise.

However, I had considered that I might go for 3" on the downpipe and centre section, and wondered if I could bolt my standard STI BB onto that until I find a suitable replacement BB (hence the question about mis-matched bore sizes).

:thumbup:

Edited by Mystery Machine
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mystery machine

mystery machine

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yea had and look and it must have been the H&S rear box i had this one

http://www.haywardandscott.com/subaru/impreza-new-age/subaru-new-age-3-backbox.html

i got mine off ebay in as new condition for bout £80 keep an eye on there bud or in scoobynet for sale general.

The H&S looks nice, very like the standard tailpipe, which I like. How did it sound compared to the Prodrive then?

05WRX – thanks for the clips. TBH, it's hard to tell how those back boxes would sound against the engine, road noise, etc... actually the most useful clips I find are those where the car is filmed driving past the camera.

Cheers folks :thumbup:

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mystery machine

mystery machine

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Posted (edited)

05WRX thanks for the clips. TBH, it's hard to tell how those back boxes would sound against the engine, road noise, etc... actually the most useful clips I find are those where the car is filmed driving past the camera.

I did mean to comment that the Racebox does sound quite nice in those clips, just hard to judge the volume ;)

Thanks again :thumbup:

Edited by Mystery Machine
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mystery machine

mystery machine

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Facetube clip of a 2.5 hatch with H&S turbo back system:

Sounds nice, but too loud for me I think... don't want to attract too much attention to myself when I'm hoofing it around the back roads :whistle:

P.S. Guess the driver in that clip must've been pretty confident that no-one was coming other way as he appeared around that blind bend halfway onto the wrong side of the road...

Edited by Mystery Machine
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scooby222

scooby222

Posted
Posted

how about going to c and c, meercat or a powerflow type place and just get a system made up to your own requirements?

wouldnt imagine itd be a good idea to go from 3" pipework to 2.5" tailpipe - other way round would be fine

also have a look for an sti genome backbox, very nice and quite subtle - personally my prodrive backbox lasted a whole month - waaaay too quiet,release the flat four! :icon_flower:

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mystery machine

mystery machine

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Cheers for the input, Dave.

I'd love to roll into the Meercat one-stop-shop, but TBH I just can't face the thought of taking the Scoob through to the other side of Glasgow... what are the chances of getting down there these days without driving through some huge pothole? :(

Where is C and C then?

STI Genome... I'll need to check that one out, cheers :thumbup:

You didn't keep your Prodrive box, by any chance?

Edited by Mystery Machine
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Spaceman

Spaceman

Posted
Posted

go see the guys at stainless creations down bankside they are really good and have done a good few scoobs

They take there time and care about the job they do they can build the full lot with sport cat too, any tail pipe and noise you want def worth talking too.

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bobbyc

bobbyc

Posted
Posted (edited)

Iain & myself carried out exactly the same mods to the GB's with the exception of the exhausts, Iain went for a 3" full decat I went for 2.5" sportscat, difference when mapping 3bhp not worth talking about, torque was 390+ apart from the prodrive sportscat Stainless Creations in Falkirk did the rest, they'll do you any style of tailpipe you want they use cobra back boxes

Personally I wouldn't bother with the hassle of the decat route unless you think the slight gain in bhp is going to benefit you

Edited by bobbyc
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Spaceman

Spaceman

Posted
Posted (edited)

sorry mate prodrive exhaust got sold ages ago!

that looks like a good bet, didnt know about them either Greig - hows the hawk going?

yup a 330d touring now bout to get it mapped and start playing wonder what it will be like at knockers.

the hawk is now owned by big fud off Snet and is being run in with a fully forged engine with nice cosworth parts lol think its running a solid 400/400 or more and will be competing at scooby sprint when its not lapping the Ring.

and yup they def do sport cats at stainless creations

Edited by Spaceman
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mystery machine

mystery machine

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Greig and Bobby:

Just wanted to thank you for putting me onto Stainless Creations – spoke to Graydon today. They seem very willing to accommodate and reasonably-priced too. Been quoted £640 for a 2.5" bore two-part system – sports cat pipe up-front and a dual-silencer pipe behind that.

Almost certainly going to go for that.

Thanks again! :thumbup:

Edited by Mystery Machine
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