Unfortunately it requires you to buy an American car.
It is sad that thanks to decades of brainwashing by rags like Consumer Reports American cars are considered bad. Have you seen the ratings since the mid to late 90's? While on average the big 3 get lower marks then Honda and Toyota the difference is often statistically insignificant. Just check out JD Power rankings.
Has the American car industry actually managed to get a whole 100bhp/litre out of a normally aspirated car yet? Or install suspension that wouldn't feel more at home in a super-soft bed?
HP/liter doesn't matter except in size limited racing or where vehicles are taxed based on engine size. Do you know how the small engines get past 100hp/liter? They do it by being high spinning motors. HP is based on torque and rpm, so if you spin a motor to 7,000 rpms you make more HP. One reason that domestic motors have lower output per liter is because they are much bigger motors. How about we compare torque output, those high revving motors have very little torque. All other things being equal if you take a larger motor making the same HP as a smaller one, the larger motor will be more drivable.
Top Gear regularly make the joke that American car engines are made out of pig iron. And that was certainly true when I considered, for a whole 5 minutes, buying a Ford Mustang. A modern performance car with a *solid* rear axle and a lump of volcanic rock for an engine? No wonder I went out and bought European instead.
Depends on what type of performance you are looking for. Many people who buy Mustangs are still more interested in straight line performance such as drag racing. In those cases a solid axle is much better. The Mustang Cobra's used in drag racing have had problems with wheel hop which can destroy the IRS.
Putting this 'appearance pack' on a Chevrolet is like putting lipstick on a pig.
Purely subjective. I know of several people who pre-ordered Camaro's that went with aftermarket stripes to more closely match the movie car. Though based off the conversations and looks I've gotten in my 2010 Camaro, I'd say you are wrong and many people love the looks of the new Camaro.