I know someone here has to be running these things, so I thought I would ask. I have a delima with the Mac 1 5/8" direct fit long tube headers and their 2 1/2" off road h-pipe. For some reason, my driver's side header, after the h-pipe is installed is pulled over toward the center of the car about an inch, causing the h-pipe, once installed, to rest right onto the crossmember. Now as you can imagine, with the exhaust sitting right on a rigid part of the car, what kind of vibration this thing makes, plus my car is not stock, so the engine really lopes and just makes for a very unpleasant drive. The power is awesome, but the vibration sucks. I have thought about going back to shorty headers just to avoid this, but I really hate to waste more money. By the way, my car is a 5 speed, so could I maybe have the wrong headers or h-pipe? I have contacted Mac directly, but so far, they can't help me. Anybody else out there with these same issues? By the way, my headers, I was told were for an automatic, but I had a C-4 in the car when they were installed, and it still did the same thing. Later, I was told they were for a 5 speed car. So what gives, I have had both transmissions with this same exhaust set up, and with both, it was exactly the same. If you guys can help, that would be great.