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I waited until I added HF cats on my L99 to get a tune.
I can tell you this, you'll be VERY surprised at how much it "wakes up" the car.
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Retired:
1987 Cavalier RS
1990 Beretta GT
1993 Cavalier Z24
1987 Formula Firebird
1995 Ford Probe GT
1995 Camaro Z28
2000 Camaro SS
2003 Monte Carlo SS
2011 1LT Camaro
2013 2SSRS Camaro
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