Quick but not tooth chipping firm, even at wot. I sent an email to Zoomer to figure out how how much more PSI he adds to the tune. Will see if he replies..
2005 GPGT- Top Swapped Click me!15.5 @109
2002 GPGT- slow and stock
1993 Oldmobile 88- exploded the diff @158k GPF Resident Flowmaster Troll