Ok so, I have an 18 GT. I run Corsa Extreme, Corsa longtube headers and no cats. I absolutely love my loud obnoxious stang but the neighbor in my new complex have a different opinion. The issue is the cold start. It sounds like a bomb going off. I’ve even had it tuned where the valves won’t open up all the way and it doesn’t help at all. My question is if I swap out the corsa extremes for magnaflows will this help my cold starts not be as brutal?