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Old 07-17-2005, 05:13 PM   #6
Scooby Newbie
Member#: 65462
Join Date: Jul 2004
Location: Riverside CA USA
01' 2.5RS
Silver/Carbon Fiber

Impreza GC8

I have Borla headers, 2 1/4" test pipe w/ o2 sensor ports, 2 1/4 piping to a 2.5" STi Axle back muffler.

SOUNDS LIKE CRAP! I am buying new CATS as soon as I have an extra $571. It sounded way better with the cats on with the same setup. my old cats took a dump on me. They sounded like there were a bunch of nuts and bolt rattling around in there. Not much improvement with the test pipe.


I have to admit, I felt a big power difference when the cats were removed. I'de say an easy 5-10 horsepower to the wheels. I was very supprised.
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