I have a 2011 mcs with a stage 2 RPM tune and I’ve had it for a few months and it just started popping less on deceleration (the exhaust pops and bangs) and it will pop once the second I push the throttle to accelerate. I know it’s not supposed to pop on acceleration but I’m not sure what could cause this and how bad it really is? Any help would be greatly appreciated

 

The car will stop injecting fuel on decel, so when you get back on the throttle it will start injecting again which will make it pop. Mine does the same thing on light throttle.