Hi Jerry,
I am running a 76mm, but I am considering an 88mm...
Regarding the cage, mine went through inspection with flying colors. Just make sure you have the right size plates to weld the tubing to (I don't remember what the required size is), and also make sure the tubing is the correct thickness for the cage cert you want.
As far as my car, I am battling a gremlin that has had me perplexed for over 2 months now. I have been through the turbo, the wastegate, the tranny and converter, intake, piping, couplers, intercooler, injectors and still don't have an answer to what is going on. Once I build boost, the car just noses over. It happened at the track back in August. I make a couple of normal passes, then the 3rd pass, the car nosed over and went 20+mph slower and 1+ second slower and I haven't been able to figure out the problem since. I don't want to clutter up this thread, so i'll stop there. I'll eventually get it figured out, hopefully in the next couple of weeks. It is going into prime track weather here in Orlando!! Cool and dry...