Piper or Milltek (Cat back) exhaust better for Megane R26?

[Hadley1986]

Wondered if anyone has any experience with Piper vs Milltek exhausts for the Megane F1 R26? Or even just general quality differences between the two brands would be great. Thanks.

[Animal]

http://www.k-tecracing.com/show_product.asp?id=368... (it might be more attractive if you don't look at the price?!!)