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You're headed down a slippery, somewhat expensive slope, but there are power gains to be had. I've got an 00 S and I've had the Chinese headers on there for 4 years and 60,000 miles. I got CEL's and it took a Softronic reflash last year to eliminate that. The reflash also corrected a lean condition that I got, but only knew about because of taking the car for a dyno test. When I dyno'ed the car, I had the headers, gutted cats, and an EVO intake: 225 HP at the wheels, which put me around 265 flywheel. 15 HP gain isn't too bad, especially for under $400 in parts. Too bad it takes another $750 for the reflash to get things running properly.
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