if anyone else would issue such a blanket statement based on unproven claims you would be all over them like a cheap suit- maybe it is best for you and you are proud of it because it was made for you but thats not an adequate verification of your statement.
1. weight? surely those mufflers are not light, no more 13lb pound claims here.
2. hp increase (decrease)?
3. noise? i am not an expert in noise suppresion but have extensive experience with composites and nomex (or any) untreated honeycomb is not exactly sturdy. the heat is not the issue, i would worry that the pressure waves will disintegrate the honeycomb fairly quickly.
4. not street legal- no cats, not 'best' off the bat for most of us.
5. 55% heat decrease due to coating? heat reduction does not only depend on the coating but on type of parent material, its thickness and type of exposure. for your benefit find out exactly what kind of coating it is as most of aerospace coatings like that are actually porous so with heat and exposure to water it will actually help those headers rust (the inconel and hexalloy parent material in aerospace applications are rust-proof is it does not matter, 316 will rust when thermally cycled). i would suggest coating it inside and outside with a coating specifically formulated for exhausts (not porous) not doing a cross-reference based on a result of totally different application.
6. material- 316 'food grade' stainless, as i continuously point out, is not the preferred material for exhaust as it was not developed for thermal cycling but a stable, constant low temperature, it will rust/crack so it is not 'the best'. (before you point it out, yes, i do have 'cheap' headers made from 316 but i don't claim them to be the best.
you have expectations for others- play by the same rules.