Well there is no 18" tire in the world that will hook up great, BUT bfgoodrich has started making their different style drag radial in an 18" version, so thats something you might want to check out in the future.
Thats a good start on suspension mods. Next thing you might want to look into is a good set of rear control arms. Under high load, the stock ones can flex and can cause all sorts of traction problems. Another thing to think about for the future.
About the FMU, you have a few options. You could either use 36's and no FMU, and although your idle and streetability won't be QUITE as smooth as stock, it won't be bad.
Or you could use 24's and an FMU, which I do not reccomend. I'd rather have the injectors working at a lower duty cycle, than be pushing them harder with the FMU.
fyi, 36's and an FMU would be overkill for your combo
hope this helps some,
-Drew
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NMRA O/C 9516
NA pumpgas stickshift 347 10.65@125.6, 6.73@100, 1.41 60ft
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