I got the unit installed in my MY03 base a few weeks ago. Did a bunch of timed runs in 4th gear from 2000 to 4000 RPM both before and after over the same road within about an hour of each other in the middle of a sunny day. The times averaged 3/4 of a second faster after the install. Haven't seen a downside to it yet - did a DE event on the 26th and really noticed the extra acceleration.
Now for the "seat of the pants" stuff: seems like the engine idles more smoothly, very low end torque seems better - less likely to stall from a standstill, maybe has a little bit more "growl" during acceleration (or maybe it's just the mind playing tricks).
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