From what i have noticed and tell me if i am wrong, but I thought the length of your exhaust has some effect on the horsepower an engine can produce. As far as what i have seen is that the longer and straighter the exhaust passage is the more HP can be produced. For example and M3 produces 343 HP and the M roadster, which had a shorter car length and pipe length prodcued less horses with the same engine.
If this is the case, then why would the new McLauren SLR have the exhaust tips right behind the front wheels and not chanelled to the rear of the car?
help me out in understanding whats goin on