Hey, had my GT Turbo for about 4 weeks now, the car just feels alot slower, i dont know if its lost power or if im just getting used to the power ( i think so ) when i first got the car it was so fast and it would just fly up to red line so far, now after about 6k revs the car just doesnt seem to have that power i dont really know how to find out if i have lost any power, apart from a dyno, the car is slightly modded and estimated bhp is 140-150. mods are exhaust system, 0.8 bar boost, actuator - it does 65mph in 2nd gear ( does that sound right )? ps: - how oftern should a spark plugs and oil be changed also sorry if wrong section - couldnt find a suitable place