Just had JDM install the apten for me.My previous numbers before the apten was 486/496 std.The numbers today were 512/490 std.All in all i'm pretty satisfied due to the heat today (90 degrees in the shop and very humid).I feel that on a cool day i might see another 10-15 hp.:rockon: For my impressions,I feel the car is still the same until the high rpms,then it pulls like an sob!!!:-D