Dave, I just saw your post and got your PM now, sorry about that, I haven't been on the forum in a few days. If we don't connect here, I have family in Summerland and get up there a couple times a year.
Wayne, how many KMs have you put on since the install? I think you'll continue to find that drone settle down, as mine settled down after the first few hundred KMs and then I found it settled down even more. I never really thought I had drone, just a resonance, and barkier when cold. Last month I drove the Coquihalla from Hope to Merritt, then the connector from Merritt to Peachland, with the cruise set between 110-130, anywhere from 1500-2000 RPMs and it was thoroughly enjoyable, with a nice rumble in the background that was not harsh over time. Up the hills it sounded deeper than on the flat, and down hills I couldn't hear it over the road noise.
Blk Brand Sport, glad that you're happy. I did mine myself, didn't have too many problems, and would do it again as long as I had some padding to lay on as opposed to concrete, as I moved like an old man for a could days after.
I can't say enough about the sound, as they are probably some of my favourite LS sound. I tend to not like the sound of the LS compared to the Chevy 350 and Ford V8s as they sound raspier and higher pitched, but the Hookers give my car a "deep muscle car tone" just like their marketing says, without being too loud or harsh.