Thanks, man. The jets, carb tuning, air filter and exhaust upgrades did wonders for the power. All the roads I ride on, like to work and back, have a speed limit of 65mph. Of course everyone does 75mph on them. I disconnected the speedo and don't worry about it anymore. I just ride with the traffic and have no problem keeping up and passing when needed.
A few things I've noticed between it and the M. The S40 is a lot more sensitive to being in the right gear. The M you could keep in 5th and still have power coming out of a turn at 35mph. Not the S40. You have to downshift a gear or two. However, 5th gear is much taller than the M and more of a joy to ride at highway speeds. On the M, if you're doing 60mph and let off the throttle, the bike's tranny fought back. It's much smoother on the S. If you let off the throttle at 60mph, you simply cruise without the tranny drag. Shifting is a lot smoother on the S. But then again, the clutch and tranny are beefier on the M. All in all, the S is more fun to ride stoplight to stoplight and up to about 75mph. The M is more fun to ride over 75mph. The M has a MUCH better suspension. Washboard bumps on the gravel driveway were smooth on the M. On the S my eyeballs rattle.
I drive the same speed in every turn and every straight road as I did with the M, even when I was aggressive with it. That hasn't changed a bit. For those who have and M or a C and wish they had a bigger bike... you are spoiled. Some will flame me for that comment. The S will do everything the M and C will do, except with them you have a lot more of everything- room, power, torque, etc.