I've tried both of the Toomeys you are talking about.Get the T-5's.I had some mods when I tried the T-6.No porting,but it did have K&N filters(no air box),Dyna ignition(I think),and a Trinity cylinder head.It pulled pretty good on bottom and mig-range.On top end,"there was nothing".I was extremely unhappy.Later got the T-5's and they did alot better with the mods I had.With my ported banshee now(with shearer in-frames)I've actually have been beat twice by banshees with
T-5's.I think this boils down more to how the bikes were set-up at the tracks we were running.Not knocking them though.They were very fast.