Well i can almost guarantee whoever is selling that FX1 chambered pipe wont let it go for any less then 850 shipped so if cheap is what your looking for thats probably not it. But b pipes are worth the money, properly tuned to your mods. And if you decided you wanted to go that route you can wait like i did and get a brand new mod b-pipe for 750, problem with that too is they probably not gonna make any more for awhile again. I heard of the coffmans working good with some setups. Id say get one someone is letting go for cheap for the time being and wait for the b pipes to come around again.