In terms of horsepower are you talking about stock or tuned? Either way a quick search should get you the answer you are looking for.
The race exhaust sounds different depending on which car you put it on, and your final part is a rather bold claim, head over to the Tuning and setting sub-forum and let us see some of your set-ups.
I am however closing this thread, as we already have some quite extensive car lists to search (if its info on stock cars) and the tuning and settings threads already have plenty of discussions regarding which of car X has the most horsepower, a look in these places should give you the threads you need to answer you questions and reply in.
