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please take the approach that i will get shot on here for saying but its a 5.0 treat it like one and it will respond (proof in exhaust and intakes so far). that being said a simple throttle body spacer should net a nice little gain and make noticeable differences!

 

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What do you mean by a throttle body spacer? How would this help? It sounds like another gimiky part to me.
My vote was for tuning as i think this would be the most popular choice for people wanting to change the performance characteristic of their car. Its the easiest thing to do (with the right parts) and the least time consuming and cheapest. I think it would have a much broader appeal and be more of a money maker.

yes that would be great but i can tell you havent been around much. bc its not possible. Only one person has cracked a lexus ecu and that was on an is300 once years ago. and he only did it to one ecu. also if you do some searching on here and other lexus forums you will see that, that is the case.