Hey guys, just got my Cobb AP in the mail and the only thing in my 2008 GSR is a K&N drop in filter. Under the stage 1 maps I see HKSPF, PF stands for Panel Filter? Would this be the map I should run or will the Stock map be okay, even though it says stock filter only? Thanks!

 

Honestly, both should work fine. I'd personally probably just stick with the map for the stock filter, but you can try both and compare the results.