I just installed my Delkevics with the 90mm CF shorties. Its absolutely nothing like stock. I don't even think it'd be considered remotely close to stock even if I had the silencers in. Too early to tell what the durability is like but as Islandboy mentioned, and based on some great info I got from user Nealio, Delks appear to be top notch. On top of that, their customer service is excellent. Quick and detailed answers. I'm certain they will ship to Canada.
The install is still pretty fresh in my head and I've got many pics, if you want to consider the Delks and want more info do not hesitate to ask, I'll do my best to answer your questions.