ok well an apr chip on the 93 octane will bump a gti from 180 to 215 thats 35 hp i just put an apr on mine and its pretty sick and i got mine done for 490 what else can u do that cheap for that much hp and a 3inch exhaust and DP is far to large for the stock turbo setup all u need is 2.5 from the turbo back dyno proven