Just as an update,I have been running it for a few days now, and it certainly is stronger. Stronger and smoother, with better throttle response.
Only bummer is that it is a horsepower mod, not a torque mod. Down low, where I need the help, it really did nothing. Again, it is gearing that it killing me. These gears might have been ok on the torquier L27'*, but on the L36 they are just way too tall. I am willing to bet the move to 3.06'* would cost me nothing in fuel economy. In the Olds, the EPA showed them to be the same. I can see why. Wouldn't have to be forcing downshifts all the time to get power.
Anyhow, all grumbling aside, the P&P LIM is a good mod!
2004 Bonneville GXP - Greystone