I know its not sled related, but I have a Alpine Subwoofer System for sale. Bought last August, two months later I sold the truck and kept the subs in the house. MAYBE 20 hours on them. Includes two 12" Type-R subs installed in a Q-Logics enclosed sub box. Along with a MRD-1005 Amp with 1000watts RMS, and 2000watts peak. Hits hard, still have the warranty cards (not filled out), still have original boxes. I'll get pics soon.
$750 OBO

Also have a Ford 351W engine for sale