13 > 5
I just got a 13 bar (gen1 genny from 1985) and LOVE IT so far. It's still clean & new so can't really compare flare-ups yet, but just the other day I had 2 pieces of bacon on the warming rack (was cooking skirt steak), when I saw the bacon wasn't going to be done as fast as the skirt, I put it direct on the grates & no flare-ups at all. The 5 bars on the bottom seem identical on my silver b & G1 Genny, the only difference seems to be the deeper cookbox & of course the N-S smaller bars. What they seem to do is vaporize much more of the drippings.
The 13 bar design, if I'm right, will require more cleaning - more "stuff" will vaporize or get trapped on the flavorizer bars rather than hitting the bottom pan; I've already noticed a little buildup after <10 small cooks.
My Silver B - I have to give very specific warnings to people when they use it, and it'll still catch fire (warm up on high for 5 min, then switch to med).
As for stainless availability - I know a couple of stainless fabricator shops that work on restaurant equipment (tables, freezer doors, grills, hoods, etc) - they've made some intricate brackets and other cheap/easy parts for me. I'd be happy to ask for a quote or you could call and ask for a quote from
Mountain Stainless , just have the measurements available, maybe a quick/easy drawing or image to email.
*****has anyone seen the grills at El Pollo Loco? I'd imagine they're similar to what RC P buyer is selling, and I bet Mtn Stainless (or a stainless fab shop near you) could make some Kick-A grates.