I am going to be using a Garrett gt2860RS for fast spol upp and ok HP good for 300hp. Compressor 47.2mm 60.0mm TRIM 62 A/R 0.60 turbin 53.8mm trim 76 A/R 0.64. your turbo had an A/R 1,15 it to bigg for any low respons. you coud be go for gt2871R for more HP. all the Garret GT are similar to diesel in spool upp.