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Depending on the mods, datalogging might not be required, but they're happy to review a log file and email updated files. http://www.morepowertuning.com/2011-how-to-datalog-3rd-gear-wot-pull

Are these Essen?

Interesting, page not found. Somebody change their mind?

Definitely more than a couple people getting lost on their way to the Post Pix of your S550 with aftermarket wheels and tires thread.

Can try a simple temporary tailpipe insert.

Its just the throttle response changing. Slightly higher torque demand for given throttle position.

Only a 4.8% change in revolutions per mile between 275/40/R19 and 305/35/R18. No big deal.