Quote:

Believe it or not, when changing your air filter to a performance filter you actually LOSE a bhp or 2. You need to be thinking about air coming out of engine for a filter to give u any more bhps e.g you need to upgrade your manifold and full exhaust system etc for the filter to give u more grunt.

Its called volemetric efficiency! lol.

Make sense ?



lol. technical terms hey!

I understand where you are coming from, volumetric efficiency is simply the amount of air that can be passed through the engine per minute. But the standard exhaust will be able to cope with pushing out more than the extra air a panel filter can put in. Thats why people will gain a small amount of power. But 2hp will be almost unoticable anyway.

If you uprate the intake a lot, say by putting on the cosworth inlet manifold, then you will also need to upgrade the exhaust to make the best out of your inlet and keep the volumetric efficiency high.