There was less pull especially at 80 MPH. Before if I touched the throttle while doing 80 MPH she pulled hard and quick to 90 + MPH, with the 4306 although smooth it's just not there.Off the line is smooth with 4306, but just doesn't pull as hard under the same throttle pressure or position, and there is no indication of missing.All I can say is my PT seems to like the iridium plugs much better and 2 ranges cooler than stock. The iridiums with 17,000 miles pulled harder than fresh V Powers.Funny that sparkplugs.com only show the heat range "5" for PT Turbo and SRT-4,but don't show the heat range "6" that I use which seems ideal.
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