depends on the year IIRC(i know the 06-07 G6 GTPs have them, i think the GTs may have been 3500s though).... but it'* been in a few vehicles by now. the easiest one to source(and have to modify things the least) would be from a W-body... and the 06-present Impalas have them, and they seem to be all over up here... hard to argue with 240/240 N/A with an amazing exhaust note and decent fuel economy.
the F40 is also something that'* been on the table for quite some time...too bad only the G6s got them... makes for some more fab work for me...
1995 Monte Carlo LS
3100, 4T60E, OBD1 Conversion...for now, future plans include a 3900, T04E-46 (Knock-Off) turbo, and a F40.