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Hello George welcome to the world of turbos. I cant help with much but I will do what I can. If you are planning on using the stock CV carbs you will definately need heavier springs for the slides(this only took me 100 dyno pulls to figure out on my bike haha) In order to lower the compression ratio using the stock pistons you can do this 2 ways one is to make a spacer plate to go between you block and the case or you can use a thicker head gasket.Personally I would go ahead and pay the $500 bucks for a good set of forged pistons. There are quite a few people on this list that are alot more knowledgeable then I am on the GSXRs so they will prob be more help then me but I will do what I can.