I had a top of the line Sharper Image Ionizer, but switched to a Living Air Classic. Comparing the two, I highly recommend the Living Air unit

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Vince

'94 E500 2 piece SL rims, chip, K&N Filter, HR Springs. Mesa Valve "Y" Pipe, ASR Defeat, BW NOS, S600 Grille, SL600 300mm rear brakes