Originally posted by crxb16er
actually back pressure is required to keep the required vacume pressure on ur intake manifold in order to get gas into ur car, as is the same for any naturally aspirated car. if u have a turbo or supercharger u can just dump the exhaust into a huge pipe, but honda's very much rely on the correct back pressure to operate efficiently.
What kind of car do you have. A two stroke. Intake and exhaust are controlled by two different valves.
Engine 101:
Cam opens intake valve, piston moved down sucking in air and fuel(most fuel injection is supplyed just on top of the valve), Cam closes valve, piston compresses and you get power at ignition causing the piston to be forced back down, cam opens exhaust valve , piston goes back up pushing out exhaust gas.
At what time does backpressure come into play. If you have to much pressure, the exhaust gas could not leave the cylinder and your performance would turn to shit. Maybe vacuum from the air leaving the exhaust.