I've got the stock kits done, and I'm going to glue together the base and power up the Paramours this evening. Right now, the weather is too good to be messing around with a soldering iron. Some steaks on the grille are calling my name. But this evening, I'll put a pair of little one π's on the stock Paramours and give it the first "taste test."What improvements do you hear with the C4S upgrade? Why do you think it was added? If you've got some links to information on the Bottlehead site or forum, I'd sure like to see them.