It's a pair of 2x10's bolted together. I had some issues though, because the pine would split before the bike would move. I should have used something harder like oak. So i drove some long bolts horizontally through the end of each board. I also had to cut a notch in it due to the oil pan protruding below the frame rails.
2007 Hammer, lowered, Bassani 2:1(updated), torque tubes, Dobeck AFR+.
2000 Firebird Formula, 6.0L, LS3 heads, etc, etc, etc, - SOLD
HM3(FMF) - 3/7 Lima Co. 2010 Helmand, Afghanistan