I put a 180 in it..........I'm about half tempted to take it out & drill a couple holes in it , but that might ( probably) cause a CEL .......as long as i'm on the highway with good air , it stays right at R-M , get in town for about 5 minutes , right up to L.......might run a cheater switch to fan relay & switch it on high as long as it's in town.....ty4 reply