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So i recently got my cats deleted on my 2005 5.7l hemi and ive noticed since doing so, the exhaust is making like a wierd fart rattling sound almost at about 2000 to about 2500pms. It only happens if i am slowly accelerating through that rpm, car has a very deep rumble before and after that rpm. Probably good to mention i have true dual and flowmaster super 10 mufflers on the car rn. Its not mds drone because i have it shut off, so im confused on what that sound is from?
 

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Welcome to the forum. You're probably going into the Multi-Displacement (MDS....4 cylinder) mode. This is normal and, with a loud exhaust, you'll get the raspy, "ricer" sounding 4 cylinder drone. Very common. Try running it in 4th gear (not Drive) and see if it goes away. If it does (MDS only works in Drive), that's what's happening.
 
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