If you haven't pulled the trigger and happen to be in the south bay.. I have an AEM, invidia catted dp and a cobb OTS stage 2 map. HP gains with the AEM are minimal, slight noise gain but not much. I ran stage 1 without the AEM for about 3-4K miles before installing the AEM. You do get slightly more engine feedback, but most of the noise increase is after a shift/release of throttle.