the nasty wins boh hands down,but if i were you i get the adrenalin, as it is a revolutionary new impulse with amazing parts ta cant actually be put on any other impy (like the 14 way solenoid optimizer)
I very carefully DIDN'T comment on my new baby! Anyway, if you want a custom Impulse why NOT go to Smart Parts themselves for their top of the range job.
Mine isn't as pretty as a real Voodoo (though I love it dearly already)