Leave your panel filter as is or get a CAI. There's a few peeps that have gone with uprated panel filters such as the Pipercross or ITG and it's shown an increase in BHP with before/after Dynos so ETTO.
Before going to R-Tech, check your PCV, chuck a new Cam Follower on (depending on when yours was last changed) and, just in. Case you don't, run your car on 99Ron from now on.
They will give your car a health check before they map it anywho.