does it reduce gas mileage? or have any other side affects besides being louder?
i did search and it said there wont be any back pressure. what does this mean? and whats the effects of no back pressure?


Modified by 20ls01 at 7:20 PM 10/30/2007

 

it smells really bad and it attracthes cops

 

well it depends where you live, when i lived in cali i always had stock exhaust cuz cops were always on loud cars and exhausts but now i live in NC and i sumtimes cruz with open header and cops dont care so depends in ur location as well

 

back pressure i think will lower ur tq not sure but when i had an exhaust cut out on my civic and when id open the header up i wud have lots of top end but my bottom end was weak like no tq

 

i took the muffler off my gsr once with a test pipe in place of the cat and vtec sounds lovely! any other time its just annoying.

 

The purpose of the car’s exhaust system is to evacuate gases from the combustion chamber quickly and efficiently. The exhaust gasses do not flow in a smooth stream. Because the gasses are vented at each opening of the exhaust valves there is a pulse of gasses from each cylinder. Just put you hand near the exhaust tip and you will feel the pulses. In a MX-5 engine there are four pulses per cycle

The exhaust gasses produce a positive flow in the exhaust pipe. Backpressure can be likened to resistance to the positive flow of the exhaust stream. Taken to its extreme backpressure can lead to a reversal (albeit momentarily) of the exhaust stream.

 

Backpressure is necessary at lower RPMs to make the most efficient
cylinder filling

basically when i had my car open header it had less tq but when you reach vtec it pulls hard but you need back pressure