4.6L, I havent ran the car since my upgrades but on the 1/8th mile it ran a 8.9 stock. I have Roush cold air, steeda tb spacer, ford racing hotrod cams, Borla type-s axlebacks, bama tune, msd ignition coils with platinum motorcraft plugs, ford racing 1.5" lowering springs front/back, ford racing strut tower, staggered gt4 wheels with sumitomo tires. So far (in mexico ;) ) I have beat a 2010 ss. I dont go to "mexico" much. The reason I got the cams is due to a friend of mine has a 2011 v6 mustang and he was pulling me. His number on the dyno were 289rwhp and I was at 276 stock :( now I'm at 301/314 to the wheels and he cant hang anymore lol.