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Old 07-23-2004, 23:22   #1 (permalink)
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pacemaker extractors on au xr8

well i just had pacemaker extractors and twin 2.5 inch hi flow cats fitted to my series 3 au xr8 5 speed manual today and what an improvement it made. the car is far more responsive right thru the rev range (no bottom end loss as some have suggested). the seat of the pants feel is a massive improvement over my system i had which consisted of just a 3 inch cat back system with 1 muffler. the sound has improved heeps too with a much deeper and a lot louder note than before i reckon it sounds like a touring car. just thought i would share my experience so that other 5 litre owners could get a better idea of what gains r to be had by adding a free flowing exhaust system.
regards from adam
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series3 xr8 5 speed manual, pacemaker extractors, hi flow cats, 3 inch exhaust, lowered cold air intake, k&n air filter, 3.9 diff gears
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Old 07-24-2004, 06:48   #2 (permalink)
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Re: pacemaker extractors on au xr8

to true i did the same and also the home made cold intake what a big difference from the tickford set up
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Old 07-24-2004, 19:08   #3 (permalink)
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Re: pacemaker extractors on au xr8

did yours get a heep louder when u put the extractors on and how many muyfflers r u running
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series3 xr8 5 speed manual, pacemaker extractors, hi flow cats, 3 inch exhaust, lowered cold air intake, k&n air filter, 3.9 diff gears
13.9584 @ 98.51 mph 1.9447 60 ft
188.9 rwkw 525 nm of torque
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Old 07-25-2004, 05:34   #4 (permalink)
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Re: pacemaker extractors on au xr8

Mine picked up a few db when i fitted the paceys (comp) much meatier as well....
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Old 07-26-2004, 04:17   #5 (permalink)
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Re: pacemaker extractors on au xr8

yeh i was wondering if it was just the extractors or also the hi flow cats that made it that much louder i knew it would get deeper and meatier but i didnt realise how loud it would be im wrapped with it. it accleerates so much smoother now as well
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series3 xr8 5 speed manual, pacemaker extractors, hi flow cats, 3 inch exhaust, lowered cold air intake, k&n air filter, 3.9 diff gears
13.9584 @ 98.51 mph 1.9447 60 ft
188.9 rwkw 525 nm of torque
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Old 07-26-2004, 04:41   #6 (permalink)
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Re: pacemaker extractors on au xr8

absolutely agree, nothing like freeing up from the stock headers.
After advise from my sources I got the latest Genies and still used the rest of the stock system for my Series 111. Had to change the stock cats as they were too wide with slim line ones due to the Genies being much longer in piping compared to the stock headers. Also replaced the centre mufflers with 18" straight through hot dogs but left the stock rear can.
The result is awesome,no more lag down low and the pull it has is great to feel.
The sound is deeper and tougher,its a joy to drive every day.
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Old 07-26-2004, 06:22   #7 (permalink)
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Re: pacemaker extractors on au xr8

Is it worth changing the stock cats? Alot of exhaust shops say dont bother they reckon they are heaps better than the holden cats.
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Old 07-26-2004, 18:27   #8 (permalink)
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Re: pacemaker extractors on au xr8

Cobra my sources advised the stock cats are fine for the street use most of us do.
I noticed while the guys were changing my stock headers to aftermarket brand headers,the cats are set back at least another foot which once monted the stock ones were too close to the gearbox and other areas that we were concerned what the heat may cause. Thats why we fitted slim line ones for my fitment otherwise I would have still used the stock ones and saved myself more $$$.
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Old 07-27-2004, 04:06   #9 (permalink)
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biggrin Re: pacemaker extractors on au xr8

WILD6- running a cross piece and twin mufflers no res.the cats on ours are 21/2" high flows anyway.The sound got loader and more torque they flange the cats and as said they are further back also more hp
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Old 07-28-2004, 00:46   #10 (permalink)
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Re: pacemaker extractors on au xr8

so the au cats are 2.5" i was lead to believe they where 2-2.25". i have been looking around for some holden gen 3 cats because they are 2.5". I actually hade someone ask me if i still had my standard cats on because they thought it sounded restricted. can any one variefy the size of the au cats i may be able to stop looking
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