I took my GTX2860's out of my setup and put the -5's in, that I fitted brass bearing cages to.
I'll hang onto the GTX's and get my 2530 front housings machined to suit the GTX's, then it'll will be on again!
Biggest difference I noticed between the GT series and GTX series is the intake noise/spool. The -5's are a lot noisier with whooshing, lots of air movement, and the GTX's being pretty quiet even at 24-25PSI boost (keeping in mind that this is on BP98 only).