Filter Tuning

A lot of debates and technology have gone into filters, I have no preference to filter choice as long as it is cone type. The standard air box on the evo is too restrictive and normally does not allow more than 1.5 bar of boost. The only advantage of the standard air box is heat soak while the car is idling, however once the car is moving the cone filter will provide just as cold air as the standard airbox. The best choice will be to get a cone filter in a box enclosure which will give the best of both worlds.

Induction pipes made of metal also tend to conduct too much heat, I wouldn't normally recommend metal type induction pipes between the turbo and the air filter. We are really limited by what is available on the market. If you are going to be running using a reprogrammed standard ecu as with Ecutek then you will need to retain the standard air flow meter which will limi the choice even further.

One more thing worth noting about induction pipes, they need to be as big as possibly allowed. The bigger the air filter and induction pipe, the easier it will be for the turbo to suck air and produce pressure. a good example for that is rally cars, which run 34mm restrictor on the turbo inlet which is effectively the same as running a 34mm induction pipe, will struggle to produce 0.5bar of boost at 5500revs and that is why they will only produce 320-340bhp.