On a racetrack or auto-x, a 350hp (or less) Mustang with proper
suspension will smoke most cars with higher HP (only). Heck, a stock HP Mustang with killer
suspension would crush most other cars.
The same holds true for the street. I was once "approached" by a Charger SRT8 before. We were rollin' along and he kept goosin' the gas pedal. I was in 2nd gear at 4K, he was in a dorky automatic. Well, from 2nd gear well into 3rd gear, we were side by side. Yes, his car weighs more, but it's also rated at 426hp at the flywheel. I have a
K&N drop-in filter. Whoopee! (He asked me if I had a SC....he said it sounded like I did. I told him my car was stock. I'm sure that ruined his day.)
My idea of a perfect street-able Mustang (and the goal for my car)...is about 380hp at the wheels with bolt-ons. This will prolly need heads/cams, but essentially bolt-on stuff. Add a Griggs Racing
suspension and my car would eat quite a few "better" cars for lunch, and dinner.
If you have too much HP, you'll lose every time on the street. Unless you have the
suspension (and tires) to make it work. Some nights on Woodward Ave. you can find cars with full-on slicks. Those are they guys you don't wanna mess with.