thats not true about the tweecer. go on there website, for the 87-95 mustang the best one they have is under 600 bucks. you can also get one for under 400 they both do the same thing but the one for 600 you can view all the ecu parameters in real time on your laptop. i'd go with the tweecer because if you get a chip burnt any new mods you need a new chip but the tweecer you can adjust whenever you want. i'm about to pick one up myself