It depends on how much you are willing to spend. Lets say a gsr swap runs $3500 and a drag turbo kit at $3000 together thats $6500. Now if you start with an Ls you can get the swap for under $1500 spend $3000 on the kit and still have $2000 to build the bottom end for more boost and have better fuel management ect... In this case the ls will be alot faster. It really depends on the kind of money you have. If both are built the gsr will be alot faster but also alot more expensive. HTH
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Don't bother giving me "rep", I won't return it and I think it is stupid.
Gracie Barra Clearwater
Gyms in Clearwater, St. Pete and Port Richey
pm me if you are interested in trying a free class at any of the gyms.