Tuned a car with one of these yesterday. I've noticed on the last couple of these I've tuned that they really jack up the MAF a lot more than you'd expect a TRD product to do. With the stock rom it was pretty far off... causing power to be down considerably up top. After tuning we were able to get it all back and make some pretty nice gains.
Virtual dyno runs for comparison purposes only obviously (it was a street tune). They were made same day/conditions/road/etc though. Only difference was the rom:
