Nobody close in your division? My buddy blake clements runs DDZ's in M3 and is currently sitting at a 159.2.
Who are you again?
And don't give me any bullcrap about being "daily" or tuned low or whatever. You brought up MECA scores and classes, so I don't want to hear about why you lost.
To anybody who say's that DD's (new or old) can't play low, obviously they didn't try hard enough. One of my old teammates had 4 9515f's that did 155's on the dash, 156's at the headrest and 157's outlaw, all below 40 hz.
But to answer the OP's question, SP4's are beast. Honestly, any solid 2kw+ sub will do the trick as long as you build the right enclosure. Zcon, SP4, BTL, HDD, etc.
Team Kicker (R.I.P.)
Team XS Power
Team Audio Technix
Team B2 Audio
Team Tantric Sounds
2008 Bassrace 130-139.9 Regional and National Champion
2006, 2007, 2009, 2010 and 2012 MECA Champion (S1, SR1, DB1, S2, S3, S4)
One DD 9510 powered by two Sundown SAZ-2500's
Kicker KS tweeters, MB Quart 5.25's active on an MB Quart DSC480
Kicker wiring throughout.