I have a few questions, we all know how Summit copys ideas for products, than re-manufactures them inexpensivly, or just buys the companty and sells a "summit" version of the same produst. I was wondering what company they copied when they made their cheap mustang exhaust (it uses the summit "turbo mufflers") Did they copy dynomax?. My other question is about the dynomax cat back setups. There are 2, the turbo and the ultra flow. Is there a large difference between the two systems? I know i want dynomax, and i am about to order but i am curoius what the difference between the two are and if it is worth the extra $100! Thanks.