VXOC Astra-J/GTC

Good morning all. Has anyone had any experience with chipping these? Have been looking at getting a pro bitz chip. Looking for advice really. Car is as standard so was also thinking of adding a k&n panel filter too..would this be ok?any point? Basically looking to increase torque and maybe improve mpg a little...?
Completely new to modding thanks in advance.
Matt

i would stick with the bluespark pro boost or the dtuk cdr2 boxes there tried and tested

On my 1.7 is Racechip one. Car goes much beter! Consumption is a bit lower. Look at Racechip.de