I have 14" Turbo-style MagnaFlows in a 2.5" mandrel bent X-pipe system on my '70 Formula 400. It's a fairly quite exhaust and not too rowdy at full throttle, probably due to the X-pipe. The car came with this exhaust and is fairly new, so I'm keeping it to save money for other improvements. I haven't had any collisions with speed bumps yet and it tucks up pretty well considering, mufflers and all. I believe the 78-79 W72's F-bodies had under-the-floor resonators that looked similar to 14" turbo mufflers, so they will 'fit'.
Dennis
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