Call or raise? ($25 PLO8)

[stickdude]

The pre-flop raiser has been raising 70% of his hands, which is why his raise gets no respect (and why I called - especially with position)

Poker Stars
Pot Limit Omaha Ring game
Blinds: $0.10/$0.25
9 players


Stack sizes:
UTG: $5.25
UTG+1: $17
MP1: $20.10
MP2: $26.85
MP3: $27.45
Hero: $30.50
Button: $3.45
SB: $10.55
BB: $43.50

Pre-flop: (9 players) Hero is CO with
UTG calls, 3 folds, MP3 calls, Hero calls, Button folds, SB raises to $1.5, BB calls, UTG calls, MP3 calls, Hero calls.

Flop: ($7.5, 5 players)
SB bets $1.25, 2 folds, MP3 raises to $3.5, Hero ?????

My plan was to pop it if everyone folded to SB's bet, as my 2 pr + NFD + 2nd nut low draw is almost certainly ahead of the random 4 cards SB raised with. I wasn't expecting MP3 to raise, though... My hand is too strong to fold, so what's my best plan here?

[Felonius_Monk]

[Kuso]