[NoDOHC]

That is a good question, I compared fuel maps and I only added about 12% to the fuel to get it back, so I am guessing that the engine was misfiring. I have trouble keeping the AFR constant at 1800, 2400, 3600 and 7200 RPM. The AFR moves between 13.2:1 and 15.2:1 right now at 7200 rpm, I had to put a filter in the E8 for the MAP sensor, as it was seeing 5 kPA boost at 7200 (the MAP was jumping around about 10kPA).

This is the effect that I was not expecting. The headers dramatically change the VE, I had to move my RPM points around to fix a newly acquired '3600 rpm hesitation' which results from the MAP reading being very unstable at this speed. The VE peak (about 5%) is very narrow, as I need a 3550, 3600 and 3650 rpm point in my map. I was able to get around the 1800 and 2400 peak by just letting the engine go lean there, but the 3600 rpm VE peak was actually causing a misfire.

I may have to revisit the 2400 rpm MAP dance later, as it becomes a little problem when I am trying to cruise at 60 MPH (I usually don't drive 60 mph, but I was in traffic at that speed yesterday and there are still some driveability issues at that speed).

I haven't gotten to the dyno, so the 7200 rpm point is still running 'close' I can't tune that spot on the street, as it revs way too fast in second gear to do anything and I would be going > 100 MPH in 3rd.

The 5,500 rpm point is very weird, as I get misfires there even now, but my AFR is good above and below this point. I really need to get to the dyno, as even 5,500 rpm is a little fast for street tuning, although this could possibly be done in 3rd gear.

EDIT: With the minimal overlap this engine has, I thought that a MAP tune would be ok, now it is looking like a TPS tune may be the best solution again. (I hate TPS tunes because they are so temperamental.)