How about one that is too small. I know I do not want to go smaller than the T/B but is there a rule-of-thumb when sizing the two (i.e., 5mm larger than the T/B)?
ok wait is this a blow through MAF or a draw Through? Draw through the bigger the better blow though you want to keep it at 75mm with a no bigger then 70mm TB with a 66mm compresor wheel....you can go bigger but the intake pipe coming of the turbo to the intake is likely only to be 2.5in some are as small as 2in....this is to keep Volcity up.