Not the most scientific measurement in the world, but its worth noting.

Me - 96 RS I/H/E & 94 GSR Rims
My friend - 95 LS E & 15" Konig Helliums

Both kept well care of, all tuned up, both in great running condition.

We went to the strip, with the same 60' time I was getting .3 - .4 better ET's than him (and he even had lighter rims than me).

That tells me that the I/H/E did something.

Did no one see the great header test?!?

http://www.automotiveperformanceengi...om/header.html

They found one header to gain 14whp and 10lbs/tq over stock on the ITR they tested. An LS probably won't see the same gains as an ITR, but its going to see some gains.