I've heard 550......and church is reputable.

 

there are some nice things Osiris does for the ECU the UTEC can't do but I'm thinking of keeping my UTEC and getting Osiris done, since I do have a 350Z Base model. I'd still be able to adjust timing, fuel and unlimited maps, and hold on to my 0 fuel/timing map setting for theft purposes. Since the UTEC has been long paid for I'd keep it for tuning and adjustments and get the Osiris for the other functions, that UTEC can't perform like the TRUE WOT, target idle feature and speed limit removal. It would save some cash from getting the tuner osiris kit. I do like the utec map selector but it would have to be hidden to work as antitheft feature