M5 Expert (>4000)
Join Date: Jul 2006
Location: New York
Thanked 559 Times in 344 Posts
I can't give you any reliable measurement of HP increase. My butt dyno is decidably unreliable. I am planning on a dyno day in 2 weeks and ten I would be able to tell what the aggregate increase was from pulley and software. Not very helpful in isolating the ESS gains, but all I have. I think ESS may have done before and after dynos aomewhere on the board. I does feel faster and there seems to be more usable torque in the lower ranges.
The shifting improvement was significant. Enough to justify the cost in and of itself.
As far as redline, I had mine increased to 8400 (you can choose 8500 at your own risk). What I really like is that the redline on the HUD moved up, but they left the yellow line the same, so it leaves you with a larger, more usable "shift zone". I have been able to peg redline shifts much better with this setup. The engine spools up so damn quickly, that the factory yellow zone is far too narrow to be usable. I didn't really notice the deficiency until I had the wider area.
2014 M5 Competition|Space Grey|Black Merino Full Leather|Anthracite Trim|Executive package|LED Lighting Package|Drivers's Assit Package|B&O Sound System|Bel STiR Plus 9500ci|IND Side Markers and Side Vents|Exhaustmeister|Pirelli Sottozero Serie II
Past Rides:'07 M5 Silver grey/Black(Nicely Modded)|'04 745Li Titanium Grey/Black|'01 740iL Titanim Silver/Black|'91 K1100RS|'88 K75S