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Both units are good. One tunes itself as you ride and the other relies on a competent tuner to get it right as well as dyno pulls. The key is do you have a good tuner in your area that knows what they are doing. The T Max is still to new to know just how well it works yet IMO.
I'll let you all know in the next couple of months on the difference between the the T-Max and the S.E. Race Tuner.
I've got a bro. with basically the same bike as mine and I plan on comparing 'em. He's got an '07 FXSTC with stage 1 S.E. air cleaner and Rush slip on exhaust, and a S.E.R.T., and I've got an '07 FXST with stage 1 Arlen Ness Big Sucker and V&H Big Radius exhaust and a T-Max EFI unit. So far I've only been able to log a couple of hundred miles on the new tuner but the weather's getting better so it's about time for a road trip:bigsmiley11: