Bowdy04

Just wondering what you guys think, I have been running the performance tune that comes on the predator, I'm going to take that off and just manually adjust the timing, and of course for the 3.90's. I'm thinking this should be just as good, since i've heard the air/fuel on the 4.6 is usually right on. There is an adjustment for the 2K-4K and then 4K-7K (rpm's) should I just bump it up all the way on both? I think the predator will only allow 2 degrees advancement which is 12. Comments??