Doug won by over 4000 horsepower. Yep.

UsernameTotal HP
Doug DeMuro5710
token_liberal1614
Trunk Impaired 3181470
DancesWithRotors - Fiat Owner1428
Ytse Frobozz1380
jdrgoat1338
sfmikee1328
Twism1131
lonestranger1047
Jeff Simmons946
CounterTorqueSteer773
Opposite Locksmith565
Jarod Rose540
wkiernan539
Hoccy358
Übel346
TurboSloth340
jkm7680339.1
MR2_FTW - Group J's resident Stig325
The Biebster's got a P71 (Formerly not Justin Bieber)317
Peter Negru290
Chase275
EssExTee197
Echo51105
KirkyV59

In terms of average per vehicle, Doug won again. But it was closer!

UsernameAverage HP/Vehicle
KirkyV59
Hoccy89.5
wkiernan90
Peter Negru96.5
EssExTee98.5
Echo51105
Jeff Simmons105
jkm7680113
Übel115
lonestranger131
Chase137.5
DancesWithRotors - Fiat Owner142.8
The Biebster's got a P71 (Formerly not Justin Bieber)158.5
MR2_FTW - Group J's resident Stig162.5
TurboSloth170
Trunk Impaired 318183.75
sfmikee189
Twism189
CounterTorqueSteer193.25
jdrgoat223
Ytse Frobozz230
token_liberal231
Jarod Rose270
Opposite Locksmith280
Doug DeMuro285.5

Source