OK, called trinity again, they said three weeks, big gains, two into one muffler. this may sound goofy but i want twin pipes all the way through so i'm going with duncan. my questions are whether to get low-mid or mid-high. does low-mid mean more power at lower rpms, or are we talkin' about at lower speed, say more power from like 0-35mph opposed to 35-70mph. i'm not sure that this makes any sense, i know what i mean but not how to put it into words. i have an epi bright green, (uninstalled) and i think i'm picking up epi's whole kit today. i ride wide open alot, but not concerned with top speed. mostly in pits with big banks and slowly working in some track time. so i'm looking to get there quick, think i'm gonna run 20's to gear it down a little too. i'm ready to order, i just want to spend my $700 smartly, so if anyone could help, i'd appreciate it.-Sean