Uneek
Super Moderator
There must be some slight differences in the two engines.
From Toyota.com
'10 FJ
4.0-liter DOHC 24-valve V6 with dual VVT-i; 260 hp @ 5600 rpm; 271 lb.-ft. @ 4400 rpm
'10 4R
4.0-liter DOHC 24-valve EFI dual independent VVT-i V6 270 hp @ 5600 rpm/278 lb.-ft. @ 4400 rpm
Probably differences in the exhaust system, it was the case on the 3.4 V6. The third gen 4Runner 3.4 V6 was rated at 183hp vs. 190hp in the first gen Tacoma.