Thanks for the replies.
I'm currently running 13.5t boosted and I'd like to think I'm pretty consistant at my local track. Supposed to be trying 10.5 boosted this weekend and to be honest I really don't think there's going be any difference, I have already been quicker with my 13.5 than some 10.5 at my track.
Mod's are only 2 or 3 at the most laps quicker than 13.5t boosted at our track, but mod seems alot easier to set up with out all the boost, turbo etc which is why I went LRP speedo route no bloody laptop needed
I might just give my SP 5.5t a go in blinky mode.