IS300 are definately not a match for a WRX with a good driver. I watched a WRX run 14.6 and dystroy an IS300 in the process. The IS300 was running mid 15s.
The GS400 is a great car. Very close in speed to a stock WRX in the 1/4 mile beyond the 1/4 mile its all GS400. Once they get going they can really move.
I suprised one the other day. He was left wondering what happened. I was 5-7 cars out on him by 70mph. Thankyou Mark at TurboXS.