I just put a pair of Seymour Duncan Vintage pups into my Mexi Jazz bass. Eh! No big improvement I can hear. They are quiet though. No mo hum. Also soloing the pups gives different tones, unlike the Mexi pups. I guess I guessed wrong on the Vintage thing. Maybe the Quarter Pounder or the Hot models would give more of a boom boom bass tone. I don't know. Installation presented some interesting conundrums. Like what the hell are those little pieces of surgical tubing for??? The tech guy at SD was very nice, but he didn't know.