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I think what Tony is trying to show is

571495044002.png

 

On this diagram it's item 32

This is an expansion box which for MY10 onwards was replaced on some models with just a resonator.

As the UK wrx-s is a PPP'd (Prodrive Performance Package) car it may already have the 2nd cat removed and have a Prodrive backbox ??? so the next logical step would be to replace the centre pipe with a straight through.

https://www.haywardandscott.com/subaru/impreza-turbo-08-onwards/08-impreza-centre-pipe-single-exit.html

 

 

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9 hours ago, The Don said:

I think what Tony is trying to show is

571495044002.png

 

On this diagram it's item 32

This is an expansion box which for MY10 onwards was replaced on some models with just a resonator.

As the UK wrx-s is a PPP'd (Prodrive Performance Package) car it may already have the 2nd cat removed and have a Prodrive backbox (silencer) ??? so the next logical step would be to replace the centre pipe with a straight through.

https://www.haywardandscott.com/subaru/impreza-turbo-08-onwards/08-impreza-centre-pipe-single-exit.html

 

 

Thanks Don ? I think prodrive left the resonator in on some models only tanking our 2nd Cat. But not 100% on that

If you have box that looks like a squashed water bottle then that’s the resonator 

 

tony

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  • 10 months later...

Hi mate I have the same WRX-S with the Prodrive exhaust it is very quiet! Did your vortex make it sound any better? also didn’t think the vortex fit? But the afterburner was for the hatch? 
 

http://scoobyworld.co.uk/catalog/product_info.php?cPath=24_207&products_id=1439

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  • 1 year later...

Hey guys still currently running the afterburner more than a year on lol 

had clutch & lightweight flywheel fitted plus oils shortly after the last post and this year has seen full service, cambelt/water pump/thermostat, plus under-sealing and white line rear anti roll bar with drop links! Also got the Killer b oil up pipe and baffle plate to fit in the sump! 
moving on from that was thinking of getting a cobb ACCESSPORT v3 and replacing entire exhaust system with a 3inch from cobb or invidia? 
any suggestions 

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