Sure it is...sort of. If you "just" delete the U-bend - you will stay at the stock exhaust size from the manifold to the muffler = 2.25". If you put in a 3" downpipe - you will help the motor breathe - but you are still going from manifold -> 3" -> 2.25". The "ideal" situation is to go 3" DP to full 3" exhuast - but that can create a cash hemorrhage.
-Swash