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
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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From: Api 500+bhp MD321T @91dB Probably SN's longest owner of an Impreza Turbo
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
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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From: S E London........ 555 Wagon Sqn
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
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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From: S E London........ 555 Wagon Sqn
Originally Posted by SpoonZ
so you bought an uppipe, downpipe and back box? leaving the centre section standard?
do you have a knocklink?
do you have a knocklink?
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