Luke, got a couple 400's and have used exhaust parts from Bosal when I needed them. 10 years later they're still in there. Not sure if Bosal is the most economical, but they've been durable.

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'89 260e (212K Mi.), '92 400e (208K Mi.), '92 400e (not a misprint) (146K Mi.), '95 C220, '81 240D--Sold