Water/Methanol. Might just give it a shot!
 

It may not give me my needed 16hp for my class BUT I'd really not like to heat soak and lose power during a 20-30min session. I know when i tuned my WRX the IAT's in the MAF dropped timing significantly!! the hotter and hotter the intake temps got!!

For $500 why not?? Whats my other option? $2000 lower with $500 GTR upper? Or $2000 AAM upper? Or $1450 on bigger TB's and 3" intakes? All of which wont keep heat at bay.

Good read, excuse the mustang part.

Snow Performance Water/Methanol Injection System - 5.0 Mustang & Super Fords Magazine