I don't have any reason to type lame bullshit.... but I used to own the Hiper cat-back and I have to say the build quality on it is equal to Specialty Z. The welding is fantastic, and the flanges are thicker than any other cat-back on the market (that I'm aware of). HKS spared no expense on that product.
I can't speak for the Megan, I wouldn't dare order a product from them again. I still have brand new test pipes that don't fit. But I LOVE my Labree/SpecialtyZ exhaust now.