Originally Posted by jordan313
they do the same thing. but its the quality and fitment that sets them apart.
+1, another thing that set them apart is the diameter. Most kits offer either 2.5 or 3in. The extra half inch helps flow a little bit more air of course. Regardless, both are better than stock so it's really a preference thing.
There's also ceramic coating and thermal coating options which I believe the same.
There are also a few on the market that offer a flex pipe. I can't talk too much on this because honestly I stop following dp after I installed mines.
OP, just do a search and you'll find plenty of 'which dp is the best' or 'what do you think about this set of dp' to get a better idea or understanding of what you're looking for. Hope this help and good luck.