Tips for HP gain?

Best investment to go faster at the strip? An extra set of cheap wheels and a pair of decent used slicks.
If you have traction problems now, what is the point of more power?
why not? I rarely go to the strip, but when i do i don't won't the power saving to kill me.

As i mentioned before i have a plan on the traction problem (will be getting slicks and move in the leafs), only thing i want to know is if i want more power, what i should aim at?

thanks.