Having owned both sets of these pipes on my MC28, here is what I can say...the newest JHA (304) pipes are made from stainless and have really BAD welds, I mean these welds are so bad I can probably weld better than them and I am not joking or perhaps they were training a new welder on the set of pipes I bought from them. The DFR pipes have really nice welds, cool silencers (Millenium) fit very well and have that cool locking mechanism under the pipes body with makes it very hard for the pipes to move unlike the JHA pipes which start to flap around after one year or so. The Jha pipes did not fit that well with the stock bodwork, but came with a spacer and a bracket that once I installed fit very well. The JHA pipes made way more power than the newer (at that time) DFR pipes and had stainless bodies, but now I have heard that DFR is selling a whole new set of NSR pipes in stainless with carbon silencers. It's hard to decide, on looks I would go with the DFR pipes, but performance I would go with the JHA pipes, on customer service and quality DFR for sure.....if you want to build the fastest NSR you can, go with the JHA pipes.