Originally Posted by SLOW_GTP
As far as losing HP on a full exhaust, you need the mods to back it up. For example: Let's say you take a stock V6 Camaro and put headers and a 3" exhaust on it, and that's it. The people that do this automatically think that they are going to be fast, but that is not so. Sure they will have an aggressive sound, but will not have the numbers to back it up. These people will be losing HP because there is less and less restriction and will not have the backpressure that forced induction provides. With forced induction, like in my case, the optimum mods that you would want to do are Cold Air Induction, headers, full exhaust. For naturally aspirated engines, if you are going for performance, it would be wise to get heads p/p; cold air intake; cam; colder plugs; and then do headers and exhaust. Believe it or not, you want to be very careful about full exhaust and headers. Like I said, I have seen many a person slap an aggressive sounding exhaust on and call it fast. It's posers like that that enthusiasts need to steer clear from. Well, thats my two pennies. Hope I didn't confuse anyone.
-Dan
This isnt true, and it's entirely dependant upon the car.