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In Reply to: Do not install a K&N Air intake on the S38 engine posted by Mel A on September 24, 2001 at 18:46:52:
I don't have any bench mark data to back this up. Meaning I didn't dyno the car before and after. But after doing Danny's mod's, my 1991 M5 starts easier, runs smoother, and seems to have more power. It didn't seem as restricted. It could be the air filter was too dirty and not letting enough air. The filter was due for a change. If I did loose 5 hps from this mod, I'd say it's still worth it for me. I can make it up when I install a chip :)