I am running the Pypes o/r h pipe. I have the early 2-piece design and the fitment was great. 2 years later and no problems at all. I have heard the newer 4-piece design is hit or miss with fitment though
I'd go for the X. Of course i'm going to say that because i'm running an X on mine at the moment. The both bring out different sounds. Just comes down to what you prefer
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