Allows the engine to breath better.
Exhaust temp has an effect on the output of a turbocharger cooler the exhaust the better performance you get.
True dual exhaust is better for performance. Most cars on the road nowadays have the "fake" dual exhaust - tips only. They feed via the catalytic converter then after the rear axle - they branch into dual (or Y shaped) thus making the appearance of dual exhaust.
An aftermarket performance exhaust can free some of the power in your engine. These systems allow for a quicker, more efficient path for exhaust gases to escape. This means your engine "breathes" better.
performance exhausts are always better for vehicles. Along with an increase in horsepower and torque, you will also get an increase in mpg(miles per gallon)
It affects how the engine breathes. The better it breathes, the better the performance.
magnaflow is better performance and flowmater is better sound
Headers. Because less or no exhaust back pressure.
I guess your talking about exhaust headers. They allow the exhaust gases to get out of the engine in a even manner and faster for less back pressure and better performance.
Headers help the engine breathe better thus better performance but the rest of the exhaust system needs to be included.
vehicles that run better than the average car and have a unique look
It lowers the vehicle height (at high speeds) for better performance and handling.
If that's the only modification you're doing.....probably not. Start with a good exhaust system. A performance chip. If you decide to do some work the heads to get them to flow better and a performance cam....yes. Then port for the throttle body.