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It is a HF. I turn about 1900rpm @ 65. With my tire size issue that is probably why I am a little under 2000rpm. I do not understand how the exhaust might hurt me. It should breathe(exhale) extremely freely. The exhaust appears to be stock size. The cat was probably bad and the header was the cheaper route for the PO. The head appears to be correct. It is a 8 valve head. The springs are very weak. I can just about push the valves down with my hand. I know BMW put extremely weak springs in the 325e engine. The "e" indicated economy. They can get 35 mpg. If I correct my distance for the bigger tires my last tank is 47mpg. I fixed the EGR valve previous to the 47 mpg run. It was not sensing the movement. And, the EGR ports were completely clogged. It just seams that my current tank is not giving the mileage of the last tank. I am driving the Das Wagon this week. Will go back to the CRX next week.
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