4-2-1 and flex pipe. I forgot what the diameters for the tubes are but it is one of the few Japanese-made headers that do not interfere with the LHD cars.
SIGH. This happened to me last week when I went to school in at 7 in the morning. FML.The next woe would come about when I was still going to college. I would be the cool guy and drive to campus top down no matter how early or how cold it was. I was lazy one morning and decided to drop the top without unzipping the rear plastic window.
I looked around and didn't see anything unusual. The next morning I did the same.
Then it donned on me. THE WINDOW!!!1!