Anyone try 2 washers or about .042 thickness? The reason I ask is I bought a pack from radio shack and the thickest washers in the bunch are .021. Which seems a little thin. Was going to stack 2 together and was wondering if it's just a waste of time. I have all the standard air box mods plus an XR's Only slip on pipe. Was going to run the 58/160 jet combo at sea level.