I gotta disagree on the peashooters being too loud.
On the old Thunderbird i had American bell-ended megaphones with the end cut of and no baffle. They were really loud and just the down-tubes are not nearly as loud.
I was thinking about buying TT
pipes, but I dont really care if they are underlying, so I might as well give straight-trough downtubes a shot.
My pipes are NOT red-hot, but I will go one or two jet sizes up I think, depending on the plug reading.
I will also add some support for the pipes.