Hello All, Got to the dyno this morning (maybe raining by Friday) and made a few pulls with the nitrous system on my 2013 GTS. First let me say that the car LOVES IT! I was satisfied with the Wheel Torque of 771 Ft/Lbs which equates to 887 Engine Torque. The horsepower is not coming up to where it should when the car is on the dyno and I have concluded that this is because the ABS/Stability Control system is interacting by pulling timing and other measures at about the 5000 RPM mark. You can see this clearly on the graphs. Here are some facts.... 1. The first pull of the session is always smooth with a positive and predictable climb in horsepower. 2. By the time the car slows on the dyno after the first pull, the ABS/Stability Control/ECS System has sensed a failure due to the back wheels going fast but the front wheels not moving and therefore all of the associated idiot lights come on and the traction control button is rendered useless. 3. Every run after the first pull, whether with or without nitrous then shows the sharp reduction in power at about 5000 RPM along with continued enrichment that is evidenced by the air/fuel ratios shown on the graphs. 4. NOTE: The torque is NOT affected as peak torque takes place at or before 4000 rpm on all pulls. 5. I tried different jetting giving a leaner mixture which helped a small amount as evidenced by the 664 hp pull over the 640 hp pull. 6. I tried also starting the pulls at a higher rpm (this lowered peak torque as expected) in hopes of moving the 5000 RPM anomaly up in rpm also, but this did not seem to help as again at @ 5000 rpm the power went flat. 7. When this occurs on the dyno I can actually see it in the movement of the tach and hear it in the exhaust tone. The GOOD News...on the street (when the stability control/ecs/abs is working normally) the car pulls solidly through every gear. The spark plugs look great and i cannot sense any abnormalities from nitrous use at this point. Take a look at the graphs below and feel free to share your thoughts......these are OUR cars and if WE can figure out how to get around some of the tuning issues, at least when using dyno's, we can all benefit from them. I hope to go back to the dyno on Friday. My plan will be to NOT use nitrous, but instead make pulls while pulling fuses for the affected systems in hopes of taking these systems out of play. If I can find the correct fuse or system and eliminate it during dyno tuning, the horsepower should return to a more normal and linear output and display as such on the dyno graph. Finally, if you have not seen the video of the 13' Viper at Livernois Shop on the dyno, please watch it. Here is a link. What is important to note is during their set up you can see clearly that they pull 1 or 2 of the 4 plugs off of the ECU! I tried this but only got immediate shut off or inability to start the engine. Take a look, you will see them pull these in the beginning of the video. I have tried to reach out to Erich and Dick with no response. http://www.youtube.com/watch?v=ZrTyJXIyeEY WELL......I AM UNABLE TO UPLOAD THE DYNO GRAPHS......SYSTEM SAYS I HAVE EXCEEDED MY QUOTA?? WHAT DOES THIS MEAN?