@ stillsoldier4christ
If you are in Germany, as your flag indicate, Im sorry to say that the shipping of the Fullsac pipe is.... a bit expensive to Europe.
I bought a V&H power cell pipe from my HD dealer (in Sweden) for less money than the DX cost, + Swedish tax and the shipping. How good the DX pipe might be, to pay a 25% extra in shipping is a deal breaker for me.
I did buy the "CVO Power Cores" with the "Techmat Blankets", and most importantly, the TTS tuner.
The power cores is an easy installation and in my view fully reversible to stock if needed.
It is as some one pointed out, nice to have the correct part number and spec stamped on the muffler.
Edit,
For my 09 Ultra, I bought the DX pipe, the shipping was more resonable back then.
The DX, a good product, but expensive to get over to Europe.
I guess the importers of V&H get the shipping down per unit, container load on boat.