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Old 03-13-2003, 17:26   #1 (permalink)
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Au Series 1 UPDATE CAT SIZE

Hi eveyone, In need of some greateful Knoledge, Does the Au Have a 2.5 inch Cat. Just getting Genies Put on the Au this weekend and hopeing the cat is 2.5 so i dont need a new one.


Thnaks For the help

Steve B


PS
Genies and Pacmakers is there much differance betweeen them.

Steve B
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Old 03-13-2003, 18:23   #2 (permalink)
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Id assume the stock cat for a 4.0L would be 2 1/4??? Definately not 2.5'.Ive got Pacemakers and they do a good job.If your getting a cat just ask for a stock 2.5' cat and not a 2.5' sports cat.
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Old 03-13-2003, 18:39   #3 (permalink)
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Ask for a high-flow 2.5' cat
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Old 03-13-2003, 18:43   #4 (permalink)
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I got a 2.5' super cat but it cost heaps.Then another place told me a stock 2.5' does exactly the same thing????
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Old 03-14-2003, 02:35   #5 (permalink)
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So long as the original cat is in good condition have the shop fit it up to the 2.5 inch system.

High flow cats; sports cats and furry cats really don't make all that much difference except in what is left over in your wallet after you have the system fitted.

A genuine exhaust shop will look at your cat when they pull it off and advise you if it is suitable.

Other exhausts shops will tell you to spend $300 on a high flow cat.
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Old 03-14-2003, 02:42   #6 (permalink)
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standard cats are 2.5 in 2.25 out use the standard cat unless your going a complete new system
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Old 03-14-2003, 04:05   #7 (permalink)
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It makes good flow sense to use a big cat, the more of the surface area you expose to flow, the more efficient it works.

I had a 3 inch high flow cat, on the back of pacemakers going into 2.5 inch tailpipe. On my ED worked real well, the bastard would roar to the redline!
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Old 03-14-2003, 04:07   #8 (permalink)
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biggrin

BTW, the cat in my avatar is high flow as well.

And if you have more than say 100,000 k's on your car, it may be worthwhile replacing it anyway, as it is most likely stuffed.
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