Ill stick with my local muffler shop (Mandrel Bending solutions) and either buy the stainless pipe and weld it my self or have them make one for about half that price, IN STAINLESS, ill pass. for $500 bucks i can have any dual system with all the bells and whistles. I had them price me out the pipe to do my mk3 in tick wall aluminised steel pipe, $78 bucks for all the flandges, pipe, bends, flex and so on. Learn to weld! or have someone local do it. I dont do much TIG, not enough to do a system for someone professionally but i mig all day long and plenty of people out there do a good job too. Find someone local to make it for you for literally half the price. Also those wleds on both of those systems are NOT stainless welds or even back purged. enjoy your rusted welds in a few years unless you have them ceramic coated. The rawkins are however so if you had to pick, go with them and make sure that the flex pipe is 100% stainless and not steel with a stainless cover.