rpm.. are you old enough to have a licence?
I rode in several of those "shelby's"... My sons stepdad had one. They were ok when the turbo kicked in but any 5.0 mustang woulda blown the doors off em. I don't know what town you are in... maybe one at 12,000 feet? maybe you live at 12k and all the cars you raced were carbureated and there was no mechanics that know how to do tune ups?
miatas are gay... It is allways funny to see some middle aged man who has been forced to drive his wifes miata to the groccery store to get feminine products for his wife.
lazs