My set came with nothing but 2 bars, and the hardware to hook it up - So this is the most directions I've seen so far. I'm going to do some site and web searching, I'm sure I'll find the answers.
Comp Engineering has
instructions on their web site (PN C3140) or you can also find them at
Summit.
If you get the bolt in ones, make sure you weld them in, too. Keep a fire extinguisher or water spray bottle handy...
As far as subframe connectors, I just finished welding in Global West ones last night. I still have other things to do to the car, so I haven't driven it yet, but I did hold the car up with jack stands using the connectors after I finished, and the car is pretty stiff now. The old unibody was flexing a lot after 430,000miles...
I might try to weld in risers like the Maier subframes have using boxed 2x2" square tubing or several 1/8" thick sheetmetal strips going from subframe tube to where the floor meets the rocker panel (similar to Maier, but custom to my car), but I'll see how stiff the car is after I weld in torque boxes. I might decide the car is stiff enough.
Oh, and for inquiring minds, I had the car level and
suspension loaded with the front tires on ramps and jackstands on rear axle (with rear wheels off to get access). I did remove the interior and carpet and moved brake and fuel lines, but I didn't have to remove the dual exhausts or anything else.
Daniel