Is there really anyway to tell if my po did anything to my Stang without tearing apart the engine. It seems to pull pretty hard compared to just what I've heard about mustangs. I know the exhaust is a full header back exhaust. I mainly want to know so I don't buy a ton of crap I don't need if it already has it. I plan on putting a cam in, heads, and intake. Any thoughts. I can get engine bay images. And just as a point of reference that probably won't help to much but I can get my mustang up to 100 just on the on ramp to the interstate and still be in third gear. But I also can cruise don't the interstate doing 70@2000 rpm. First post I apologize for how long and dumb this question probably is