Hey guys, just bought a Subaru WRX 2018, stock, no Tune. Was doing some pulls and I noticed that the power would drop at 3000 to 4000 RPM and kick back up, and not do it again on other gears. It usually occurs on 2 gear and then other gears is just fine. I think from the research I've done that it could be a DAM drop, I don't hear any Knocking, and I dont have a Cobb Access Port yet, just wondering what it could be? Im running 93 octane gas, could it be that the guy before me was running lower fuel octane and the ECU is learning the new 93? I just replaced the oil, and put a new Air filter in, just a normal air filter for the car? Any ideas? Thanks.