I heard great thing about this charge pipe but I also heard about the fitment issues on some members. So I just went with Dinan (especially with 10% off sale + 100 bucks Dinan gift certificate). No problem on the fitment.
At the end of the day, it doesn't really matter witch brand you have (Dinan or Technocraft), adding bigger diameter elbow/charge pipe, def. works.
I'm sure other vendors will make cheapo versions of them soon.
PAST: 14 F10 M5 | 11 E70 X5M | 08 E90 M3 | 08 E92 335i | 03.5 E46 M3 | 99 E36 M3