for me, it depends. If you're racing type dump the Evo instead of 6A12TT.But if you're going to cruise,boost here and there without lagging (good for zig zagging the busy road) and enjoy the marvelous sound from ur exhaust...then this is a good choice.Maintainance wise, just the same like other turbo engine cept at 75k mileage be prepare for about rm1.2k maintainance cost (6 iridium spark plug, timing belt,etc). For me I think it doesnt matter much cos I hardly can touch 75000km mileage in 2 year time. What I like most about 6a12tt are their response.Every time I tap the paddle, I know the power is there. No need change gear. Last month V-Sixers got a track day, on that day I realize is that my friend perdana with evo II engine can archieve 190kmph on that straight road but so're my 6a12TT. They may go faster 0-100kmph but 100-190kmph I think 6a12TT is faster. Too bad there's no drag race that count from 100km unless 6a12tt would be 1 of the engine choice.
just my 2 cents.