Drove a buddies JLR a few months back, manual with 37s. Couldn't tell any real loss of power. That 6 Speed is a bit more touchy to get used to than my NSG370. He swore I would stall it the first time I drove it, but nope. Came close though. Also drove a 4 door Sahara with the 2.0. Was amazed at the amount of power that little engine produced on a stock 4 door.