Hey guys 
 
	 
 
	I've noticed recently when I'm accelerating hard, there is a noise . Almost like the exhaust noise gets a lot louder around the 2500 rev range , then immediately goes once above 2800 
 
	 
 
	its not a rattle or a rumble, the engine sound just suddenly gets louder for a second .
 
	 
 
	it doesnt do this under normal load , has anyone else had this? 
 
	 
 
	Its an auto by the way