Anyone that plans to do anything with exhaust mods to this motor, beware of what you put on and take off. I had a Carven TR with no resonator and it droned like a m*********r then had it replaced with Magnaflow 5x11 22" body but was still loud for my taste. So I had the shop put the stock resonator back on. It did tone it down a bit and removed good amount of the drone but I honestly thought it would do better being the Magnaflow I used is a big body muffler and would tone it down close to stock. I was on the verge of just putting it back to full stock but the noticeable gains with a straight thru muffler got me persuaded to keep it. Also keep in mind that this motor is a high compression motor (10:1) I believe, and also has DFM (which is dumb) shutting down 2 cylinders on very light acceleration pressure and lastly the adapter valve on the exhaust. If I could do it again, I'd go with a bigger body Borla, longer resonator and keep the flapper on. Once it shuts down 2 cylinders, it kills your ears were you get this inaudible really deep tone. It doesnt get loud but it's like a subwoofer hitting the lowest tones. In the morning, it would vibrate walls and would hear cups shake. Cant wait till a tuner comes out to soley deactivate DFM.