I am replacing my kitchen countertop and want to install an undermount sink which is also deeper than the current one. So I have to lower the garbage disposer. currently there is a s-trap connected to the disposer and the s-trap goes into a horizontal pipe. Can I use an L-shaped pipe between the s-trap and the horizontal pipe to lower the disposer by 3-4 inches? Would you recommend any other maximum height of the L-pipe? Any help would be appreciated. thanks.