You are going to need a larger turbo and larger injectors. Also the larger Lexus afm is a must. Sounds like everything else is right, but if you push it hard off the line, the stock clutch may become suspect and the stock rubber bushings in the rear will give you wheel hop. I think with the weight of the car you will need some very sticky tires too.
Seems like you need almost 400 hp to get a 3600 lb beast through the 1/4 mile at the times you are looking for. Stock times are around the high 16's.
Russ
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