The only true way to know would be to dyno the same engine in the same car on the same day running both sets of headers: Drive to the dyno with MSDS/CPE headers with the toer set in the trunk. Do 3 dyno runs and average them together. Let the car cool down for 30 minutes and then uninstall/install the other set and redo the 3 runs. That is the ONLY way to know and if done, I highly suspect that the MSDS headers will be within 5-10% of the CPE headers ... not bad for a 100% price difference.
