My TA51 has started blowing a bit of oil through the exhaust side(no oil in up pipe) and I was thinking about trying a stock turbo with my 3k stall - I hear it can be a fun combo. Anyway, I heard a while back that my old 49 didn't really push noticably more air until it was past 20 psi. Is it the same way with the 51? I know that they spool at different rpms, but is there really going to be much of a power loss at 15 psi or less? Also, never having been in a GN with a stock turbo, will I lose that punch I get from my 51 when it spools? Will the stocker be as loud as the 51, or is it signifigantly quiter?