You can choose 8:1, 8.5:1, or even 9:1, I went 9:1 just for pump gas. Plus spool time depends on the ar of the exhaust housing, if you want a fast spool stick to a .90 or .94, a 1.something will take longer to spool it up. Vs racing is used alot for cheaper good turbos or on3performance, or some have gone with the ebay $300 and higher ones with good results.
