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There was an SCCA racer named Lee Johnson who raced a D production 911 back in the 1980s who made his own headers. I bought a bunch of stuff from him when was winding down his racing effort. His car was on the radical side for that time. He revved his 2L race motor to 9500 RPM, and couldn't find headers with short enough primaries, so he made his own! On of the things I bought from him was a 69 911S motor, which I used as the basis for my race engine. I sold off lots of parts from that engine that I didn't need. Wish I still had that motor intact!
I modified a set of 911 headers to be turned around and face the opposite direction to fit on a 914, so I could put a diffuser on the rear underside of the car. Very time consuming even to modify a couple of the primaries. The hardest part for me was not only making everything fit, but also keeping the primaries equal length.
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