I don't know what to blame this on if anything. I have had my cruiser about 2500 miles now. It runs like a top, Has used 1/4 quart of oil in 2500 miles and is mechanically very sound. THe body is a little rough and it basically had a straight pipe with no cats that ran out under the rear drivers door. I took it to the best shop I've seen for exhaust work. The guy has put duals on my 66 mustang convertible, my scout and numerous other vehicles. His work first rate and very inexpensive for quality custom work. I told him my only concern for this landcruiser was nothing below the frame and very quiet. I have a glasspack under the drivers seat and a small can muffler under the rear passenger seat. Lots of bends though to keep it all above the frame. He used 2 inch pipe. Here are some pics. Could this be the reason I can't seem to get any power until 2900 rpm. I can't cruise 65 or 70 because in overdrive I'm only turning 1800 rpm or so I have to run it in 3rd and I'm turning 3000+. So I don't know if its the exhaust or the rpms I'm turning. Lots of highway use at 65+ for me.