This has probably been beat to death but are there any good options for mufflers that decrease the screeching from the exhaust at idle? I'm using the factory tailpipe right now with a Flo-Pro stainless race pipe. Soon I'll be installing a Magnaflow 5" *** back kit. I've heard good things about the 40" Donaldson mufflers but I don't want to completely kill the rumble...... just dampen it and remove as much of the screeching as possible.