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I can not speak for other owners but removing the R16 on my 190 made a noticeable difference. I coupled this with increasing my spark plug gap to .045
I am also running a cold air intake on my 190. This intake flows much more air than the stock setup, so when pulling the R16, it was like a night/day difference. Low end torque was increased and power throughout the powerband was also increased.
On later model cars, odbi and odbii, chip programmers remove the retard as part of their chip programming sequence, that combined with other programming can increase hp anywhere from 5-15 hp on most vehicles.
As for disconnecting the battery, I am not sure how important that would be on older, pre-odbi vehicles, as the ECU does not control much in the way of fuel, iginition or air flow. Even on later model vehicles (odbii) if you do not disconnect the battery, the ECU will relearn, it just takes longer for the fuel curves to readjust to the increased air flow
Also keep in mind that on the more powerfull engines, a increase in 5-10 hp may not even be noticable via the ol seat of the pants meter, so the results on the 400E's don't suprise me, but I bet if you had a before dyno run and a after dyno run, there would be a rwhp increase. On my Corvette, even a 15 rwhp increase was not noticable via the seat of the pants meter
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