I own the 4 and had the 3. Stock, the 4 is much quieter, slightly more efficient and very comfortable. I would not call it loud by any account, though louder than any DM or other spool.
ANTIDOTE Twister LV1
Pumphaus OC Phantom
Palmers Brass N' Wood 1K Blazer
Saved for Twister Sniper coming soon!
"I Fight YOU!!! Pew Pew!"