I've owned 2 different suppressors both were Progressive Industries. The first was a post-mounted 30amp and my second is a hardwired 50amp with remote display.
All I can say is that I haven't had any electrical problems. Can't say that the suppressor had anything to do with it or not, but I sleep better at night knowing I have one. I bought PI because I'd read good things about them. They have a help line that they monitor 24x7. I called on a Sunday afternoon and left a message, my call was returned about an hour later. They're not cheap but I didn't shop for a cheap solution, I wanted a good one and I think that's what I got.
BTW check Tweetys price, as I recall they beat Amazon on my recent suppressor.
2013 F-350 CC SB 2WD 6.7PS
2013 Eagle Premier 351 RLTS
-SOLD- 2012 X23B
-SOLD- 2003 Ford Expedition 5.4, Bilstein shocks