The bigger the better....

Most everyones GTP can flow about 400cfm of air without issue... It takes a big filter to be rated at 600cfm... and that is assuming a fairly large restriction.

Technically if you can run a giant filter, you will be really close your engine thinking you dont have a filter on there.. but it will take alot of filter to do so.

With our 600+cfm turbo stuff, we could see 30-40-50whp just from taking our fairly huge filters off and going to no filter.