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The 400 is fine for steady cruising at 75 on the highway and stop and go traffic around town. The 440 has much better part throttle response. The difference is very noticeable getting up to speed for merging at 60 to 80 and for passing on two lane roads at 45 to 60 and for climbing through...

I've not had any negative running effects caused by a properly working EGR valve. My experience has been that they reduce pre-ignition, and my catalytic converters like them.

Timing light on the windshield and drive.