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dickster, do you have a chip in the car presently? When you do the dyno runs, especially when you do the run with both the premuffler and muffler, make a run with the Motronic fuel quality switch in position 2 and position 3 to see if there is any difference in power, and make up for the possibly lean fuel condition that may be caused by the reduced exhaust backpressure. Otherwise the power gains differences may seem little because full throttle acceleration will switch to a fixed fuel map, and inject the same quantity of fuel on all runs.
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