Originally Posted by jahudso2

Why do people who do not own S197s come in to our forum and post stupid ****? I have never heard of the butterfly valves breaking off in anyone's engine, and the system is only a restriction at WOT. At any other operating condition, it is increasing your fuel economy - that is why ford put them there.

I would do the driveshaft since it will increase fuel efficiency while also making the car quicker. Plus it eliminates that clunky piece of junk 2-piece.