Just my .02, I've ran both PG and RK Tune on my F10. I wanted to powder coat mine so I switched to RK Tune. The PG ones are made really well with thick silicone and performed well. The RK Tune piping looked good, but the material before powder coating looked very um, thinnish and cheap w/o a paint job. RK tune worked great though.
They both worked well and served it's purpose.
F10 M5 by
Justin J, on Flickr