i race os speed xz with picco jl tuned, evo4 edo mod and its almost equal in performance. stock tz 3port was not that far off.
any os engine is easy to tune
own 2 of the speed version. tried with HEC turbo and jp2620, consumption is a bit more as compare to others. based on what i saw at local track, with the rite pipe such as t1050 and SAGE pipe,consumption and power wise shouldnt be a problem.