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In Reply to: ansa verus bosal xhaust systems for a 1986 635csi posted by dave on November 10, 1999 at 13:06:27:
I put a stainless steel Tri-Flow system from B & B fabrication on my 86 635Csi a couple of years ago. Purchased at Bavaian Autosport. It's a little on the loud side (it sets of car alarms in parking garages much to the glee of my kids) but definately adds some horsepower in conjunction with a chip. Installer at the muffler shop said it fit like stock and all the pieces were there down to the last nut.
David Judd