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Removing both cats???

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Old Jan 10, 2005 | 11:47 AM
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Default Removing both cats???

whats the advantage?

Just bought H&S down pipe (removes first cat), centre (which i gather removes 2nd cat) and back box.

Are my assumptions correct?

Cheers

Last edited by SpoonZ; Jan 10, 2005 at 12:22 PM.
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Old Jan 10, 2005 | 12:40 PM
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From: Api 500+bhp MD321T @91dB Probably SN's longest owner of an Impreza Turbo
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Hi


I have recently done this to MY97 turbo

You get more power, region of 30 hp if you remove all the cats. Faster spool up from turbo, ie boost comes in earlier. Slightly improved fuel consumption. better flat four burble.

Wrap the down pipe in exhaust wrap to keep the heat down in the engine compartment- do this before you fit it. Keep the turbo cover fitted after it has been cut to fit.

Andy
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Old Jan 10, 2005 | 01:00 PM
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mines an 03, just wondering if i will have to make mods to turbo cover to fit?

was going to take to my local numpty exhaust installers, so will wrap the down pipe first!
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Old Jan 11, 2005 | 10:32 AM
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From: where the Fen Tiger roams.
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...i think the MY03 has three cats, unlike the Classics which have two.
Is there not one in the up pipe?
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Old Jan 11, 2005 | 10:49 AM
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i thought that but would their really be a cat on an upipe? would be very tight for space as well as anyting else
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Old Jan 11, 2005 | 11:36 AM
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From: S E London........ 555 Wagon Sqn
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Originally Posted by SpoonZ
i thought that but would their really be a cat on an upipe? would be very tight for space as well as anyting else
Yes there is a cat in the uppipe on newage cars, i had it removed along with the downpipe cat and left the last cat in, had it checked at a MOT station and it justed passed the emissions test
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Old Jan 11, 2005 | 12:16 PM
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Originally Posted by Granby
Yes there is a cat in the uppipe on newage cars, i had it removed along with the downpipe cat and left the last cat in, had it checked at a MOT station and it justed passed the emissions test

so you bought an uppipe, downpipe and back box? leaving the centre section standard?

do you have a knocklink?
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Old Jan 11, 2005 | 12:24 PM
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From: S E London........ 555 Wagon Sqn
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Originally Posted by SpoonZ
so you bought an uppipe, downpipe and back box? leaving the centre section standard?

do you have a knocklink?
Yes i have a knocklink (very little activity) & it was also remapped
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