I'm going to say go with the Turbo bumper. Much less clearance issue than the GT3. Yeah, I know that I'm probably going to be in the minority here. Gert at Carnewal sells the Turbo bumper kit including the turn signals, etc. A bit pricey though especially with the Euro/US exchange rates. I'm sure that you could get the Turbo bumper kit from Suncoast but they'd probably have to research some info to get all the parts needed.

Interestingly, the Carrera aero bumper costs $1550 but the GT3 bumper which basically is the same thing costs $1295 from Suncoast. I wonder what the differences are between the two versions.