Thinking of changing the stock air filter on my '99 R1 to free up a few more horses and wondered which is the best route to go. :umm

Pipercross foam filter or K&N gauze etc etc etc



Or, remove the main filter altogether and go for individual trumpet socks over the intakes -
http://www.pipercross.net/competition_socks.asp

Can't help you on the old school R1 G.

My baby is running a YEC filter.

BMC got it on my 02 and 04!