Because starting with a na u maybe paid 10-15,000 on the car then to make it into a TT would cost more then a stock tt. The tt's have better brakes, shocks and fuel system and the motor is already build for the turbo. Now u can spend 6-10,000 just getting it to take 800hp. When with a tt u could be at 800hp with just bigger turbo, fuel system, cams
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