That's a respectable gain, but I don't think I could stand the drone.
The 250-260 rwhp depends greatly on the type of dyno you use. Dyno's results aren't all that accurate at measuring baseline RWHP. You have to focus on the gains using the same conditions. With that, most stock Z's dyno in the 270's-280's. Also, a lot of variables to factor in like altitude, humidity, etc.
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[09][MB][6-Spd MT][Touring][Stillen Gen III][K&N][Borla CBE][Evo-R]
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