Well, I won't argue that it won't give you power upstairs, but I think this is done at the expense of low and mid range.
Since I do not have actual dyno graphs, I can not be 100% sure. All I know is that I had the SHO-Shop which made the car feel soggy down low and then switched to the MSDS which FELT much better. Personally, I would give up a few HP upstairs for some mid range torque.
