The BG reps demonstrated the EPR system for us at my dealership, and I'm not impressed with the results. When I get to work tomorrow I can give you exact compression numbers, before and after. The test vehicle was a Toyota Matrix (can't remember the year), had over 150k miles. Compression numbers were all over the place, with a difference of I think 40 points from highest to lowest. When the test was finished three of the compression numbers were lower, in the 120 range, one cylinder stayed roughly the same compression wise. Now it probably wasn't the best test subject, however, the compression was lowered overall, even though each cylinder was closer (within 10 points or so). Again I'll get exact numbers for you tomorrow.