hey everyone the other days i went to run my car a little. Went about 12/2 win loss ratio.. but my cars rpm maxes out at 6.1k rpm im guessing its the factory chips that limits me but besides after i get a tuner i was wondering if im going out from the hole or doing 20 mph roll ins at what rpm should i be shifting any tips would be greatly apreciated 
I have a factory stock 2004 mustang Gt 4.6L V8
I have a factory stock 2004 mustang Gt 4.6L V8
