So I have my 3.73 gears installed on my 07 GT 4.6 running with a GT500 pump and 47lb. injectors and a Flow Master Cat back w/93 octane. I do on and off driving on the roads and freeway but don't drive much because I have a work car. I have my Rev. limiter at 5800. Some one told me this was low what does everyone else think?