[joshcs5k]

is there a way to get rid of the air box and just install a cone filter?

 

[cuatrokoop]

With CIS? Not really, your fuel metering plate is bolted right to the air filter housing. Your air filter housing isn't going to be your power limitation.

 

[pilihp2]

Back when my 5ktq was a 10v on CIS we took the filter cover for the airbox, cut it completely open so it was a big open square, and then heat shielded the crap outa the exhaust manifold. Not sure what it did for power, but you could hear the intake noise a heck of a lot more as well as the diverter valve.

 

[audi4kq]

Here's what I did with mine, sounds pretty similar to Phils:



Volvo also has a CIS cone filter piece that one may be able to fit to the Audi box: