I have never heard of them. Of course, when you start upgrading you will find like me you stick to certain brands. Reason is there are so many off shoots it is hard to keep up with them all. What you can do is go to an automotive shop and check out prices and compare. I find things like headers and tail pipes are for me, generic items. That is it is not a part, like a stereo system, that takes a rocket scientist to build. So after a while, I look at prices of stuff like muffler tail pipes, headers, and stuff. Example, I can go to Edlebrock for say screws and bolts for the pan gasket and then go to the generic stuff and pay 50% less. Just depends if you know what to look for. Just do like I do. Read the car magzines and after a while you will see what I mean. Like the mechanic said on one magazine, "If you buy aspirin in the generic box or the brand name box, the brand name cost more. But yet the two aspirins are exactly the same. You pay for the name and fancy box." I bought some headers for my truck and bought the cheapest ones i could find. Of course, the internet had a better price than the store. 3 years and my Chevy Truck still running good.