In stock form, the M3/M4 without Competition package sports 425HP and 550nm or 410lb/ft of torque.
The M3 CS Edition that was just released features an updated tune with 454HP and 50 newton meters of torque more from the factory - bringing total output in lb/ft up by 33lb/ft to 443lb/ft.
During our dyno test of the stock M4 software versus the stock M4 CS software, we observed an increase of 43 wheel torque max between the two variants, and a max horsepower increase of about 25HP to the wheels. The gains are through the entire rev range, giving the CS a serious advantage - not to mention all of the features and extras it has as well.
Have a look at the dyno below.
2015 M3 Stock vs. M3 Club Sport Dyno
I am too tired to post up all of the videos and other dynos, but will tomorrow without a doubt. It's been a really long week for me and I need a break.
We picked up
113ft/lbs to the wheels and
101 horsepower on a 2015 M4 with just a catback exhaust and our Stage 2+ software. Gains in excess of the CS software were 80 wheel horsepower and 44ft/lbs, with the largest torque gain of 100ft/lbs at ~4400RPM (130ft/lbs over stock spec!). A 94 octane mix was used.
I can't imagine what it would do with a full exhaust system as the car already an animal.
We are also going to have to recalibrate the sport displays on the torque side as it's pegged to the end through the whole run - still deciding on 560 or 640 as with the 504ft/lbs laid to the ground, the crank torque is well above 560.
2015 M3 Stock vs. BPM Stage II+ Dyno - Stock Downpipes - 94 Oct
Note that Stage II+ software is not suited for vehicles without downpipes and supporting modifications, but we wanted to test it and see how the car responded. We're going to go back again with downpipes etc and see how much more can be squeezed out
Edit: Look for a post Monday with tons of photos, videos, and dyno graphs. (Taking Sunday off).