I've read lots of posts and still can't seem to get a handle on this. With a performance exhaust, side cover off airbox and twin air filter with screen removed, will a DJ160 main be too lean at WFO?. I've got the needle in the 5th groove and the bike seems to run great. I'm nervous because of some posts I've read and because the DJ instructions say I should run the 170. I know Jesse says the 160 is the way to go. I've recently tried the DJ165 and I'd say it feels like it runs better with the 160. I know a bunch of guys run the 170 with good results and I don't want to be lean, anyone got any experience here? I think the DJ160 main with the stock exhaust is a bit rich but it still runs ok, I'm thinking that maybe with the peformance can and the twin air things are just right.