I just did the Mason lines on my '86 M491 cab. The engine was out for a rebuild, so the install was so easy even a cave man could do it. I also ordered the tunnel fuel lines. They would NOT install. From the engine bay, it is necessary to hand bend an "S" into the line to make the compound curve to get into the tunnel "compartment" which holds each line. I was told directly, this "compartment" is only there on M491's, and 930's. All I can say that after two men working over 7 hours each, it was abandoned. I should say in all honesty the two men were very experienced Porsche mechanics. Bottom line, Mason very nice for engine (bought from our host), tunnel lines would not work for my car. Your experience may vary... Well made product!
