[bdtbdtbdt]

I just changed OFT tunes. I went from OFT E85 stage 2 version 4.03 to 93 gas stage 2 v,4.03. I get a very scary metallic rattling noise that seems to be coming from the center of the engine bay for about 30 seconds when I start the car when it is cold. The noise goes completely away after 30 seconds. Car runs normally after that. I have driven over 150 miles since changing the tune. Any help?