I did re-use mine, and there are mixed opinions on that. The cover bolts have never been an issue for anyone as far as I know. A few people have snapped their supercharger bolts, but I think thats (and this is my opinion only) that they overtightened them by not using a torque wrench. I used a torque wrench on mine.
Normally when you have Torque to Yield (TTY) bolts, they have a value plus a degree of turning, like 40ft/lbs +90 degrees. A lot of VW's use this, and even GM used this on some engines, and you can actually feel them stretching. On VW suspension I did recently, once I hit the torque value, I went the extra # of degrees and the bolt didn't feel like it was getting any tighter, it was stretching.
I don't think these bolts are TTY, but I think they may be suspect in quality for overuse, or maybe people don't inspect the threads or whatever, so its just easier for GM to say get new ones. They seem to be doing this more, and maybe its because they know with new bolts you will have good clean threads, I don't know. I inspected all of mine and they were good. If you see sharp threads its a sign they are deforming, so again, maybe its just easier, and safer to get new ones????
If you want the safest opinion, I would say to re-use the cover bolts, and all the gaskets (if your vehicle is low mileage) , and buy new supercharger bolts. Someone said there was a whole kit from GM earlier for a cheaper price, (can't remember what post) If this is the case then you can just get the kit if you want, but I didn't get new bolts after I inspected mine. Please keep in mind I'm a licensed mechanic, so I have done a lot of car work and have seen a lot of bolts LOL
As far as Elite Engineering goes for your system, I think they have one of the best catch cans on the market, and would say you can't go wrong getting one. I used their original E1???? Can on on an SS Camaro years ago, and it's now modified to fit on my daily driver (Toyota Tacoma) and I provided a video on that.
I think a small number of the people on this forum took my CC install video the wrong way. I was not trying to sell a catch can to anyone as I'm not in that business. What I was trying to do is show how I hooked mine up and the benefit I think it provides. You could hook up any catch can this way. Some people did not like the look of the line from the throttle body, but it wasn't about that, you could make it however you want, and I was not telling anyone to do that, that's just how I did it.
Anyone can use my video to install any catch can, and just watch the "lifting of the blower" part if they are unsure of how to lift the blower, as that is pretty much required no matter what can you install. I do not think there is a better video out there showing how to lift the blower in detail. If you think there is, please provide me with the link so I can make the next one better
I going to do my best to conduct more scientific tests to see if there is any concrete evidence in placement of the restrictor, and I may reach out to Elite to see if they have any flow figures, as that is pretty much the only difference. This will take some time, as I have other projects on the go......
Also the catch can I used in my video was made by a company called APEX (which I do not believe sells them anymore - they may have had issues with Elite due to patent infringement). It is an excellent design that I believe is very similar design to the Elite Engineering. It is so well made that it does not need a O-ring to seal. The mating surfaces are so well machined it seals with very little torque to tighten, and I have used it since 2013 (I think that was the year I bought it). I used it on my 5th Gen ZL1, my Hellcat, and now my Z06. I did not go over the catch can design in detail in my video, as I don't think anyone can buy it so it would be a moot point to talk about it.
I think Elite is offering you a great opportunity to go out there and have them do the install for you.
On a personal note, on this forum you will find some people are more passionate that others, some care about keeping things stock, and others not so much. Everyone is right in their own way. I can tell you are very cautious and careful about what you do, as I see the effort you are putting in for research.
If you can tell by my posts, I really could care less about what's easiest, I'm all about what's best, and "cost of products" is low on my priorities as, as I don't mind paying up, as long as I'm getting the best, and I want to understand exactly what I'm doing to my very expensive car, before I do it.
If you have any questions please let me know.