[Dick Carne]

I personally don't care for them, and unless you are running on a good number of dirt roads, I see no real benefit. We installed one on my nephew's roadster pickup when he first finished it - within three months we removed it because the engine would not idle well, and equally did not run well at low speeds. Removing the filter alone (with no other adjustments) made all the difference in the world. I do think that they make interesting paperweights though.