Vivid Racing Porsche 996 turbo / X50 / GT2 3.8-4.0 liter stroker kit - $6500
The 996 turbo is a very popular modification platform. Used vehicles are a great value and a lot of power can be extracted from the twin turbo flat-6. Increasing displacement is certainly an option as well with 3.82, 3.86, and and 3.94 displacement options for $6500. The stroker kit obviously includes a crank as well as rods and pistons. The crank is made out of billet 4340 steel and is lighter than the stock crank. Full specs below.