hey, i know a machine shop here in chicago that plays with turbo anything. Their top tech told me that the only reason they are still in buisness is because he custom makes expansion chambers(like the ones in two stroke dirtbikes,etc,) and downpipes for turbo regals and swears these will chambers will increase your hp by 10-15hp with no other mod. Has anyone heard of or seen any of these in use. He tells me he is about to patent his products.I'd hate to buy and get burned.