Hoping it's about 6300 because that's about when it starts to miss
Just piped and clutch kit
Power commander definitely a good upgrade. Around $400. But if you're gonna put one in spend the extra money ($300!) For the autotune module. Its well worth the cost as you never have to download any maps and it constantly alters the tune to accommodate for changes in altitude,temperature, or anything else like that so that your always running an optimal map for the conditions
I think I have a bud who took out his power commander maybe I'll try him first
I don't even know if he has software for it
Sounds like you are hitting the rev limater ,which is close to 6400 +/- a bit. You don`t need a pc5 un less you are running a different air filter and FULL exhaust system,that is very open. The 700 comes pretty fat from the factory,i would dought you are lean with just a pipe. It is more likly you are clutched a little light and are revving out a little quick.....