Aftermarket Exhaust; More Power?

[hasher22]

An aftermarket lightweight pulley doesnt give u more HP, it just revs up faster thus giving u faster speeds....

an exhaust will give u hp gains thus more airflow, so will a muffler.......

[WRBlue]

Originally Posted by hasher22

An aftermarket lightweight pulley doesnt give u more HP, it just revs up faster thus giving u faster speeds....

Lightweight and underdrive don't create more HP but they do free up HP lost due to parasidic drag. Your engine makes the same power, but more of it is transmitted to the wheels. Its the same thing as a lighter flywheel, lighter wheels, or a more efficient transmission - none make more power, but they will show up on a roller dyno. Everything but the wheels will show up on a hub dyno.

Faster revving will not get you to speed faster, only more wheel HP. And it definalty will not let you go faster - thats either a function of HP and drag OR transmission gearing. Faster revving will give you better throttle response and worse shifting till your used to it - revs will drop faster too, less mass=less kinetic energy.