If you are looking for bang for your buck (powerwise) exhaust is not the answer. Price per HP is not great here. There are better options to make power if sound isnt a factor. But it is a component in powermaking as it frees up flow and relieves backpressure at higher boost levels throughout the powerband. For instance Armytrix utilizes dual runs of 2.5" from the collector downstream of the DP to the muffler which is much more free flowing than stock, which i believe is single 3" run. No affiliation, metioning because i own and installed it. Most aftermarket exhaust weigh less also in comparison to stock systems. I think the stock system bottles up the beauty of the N55 and if you uncork with a proper catback/DP... The world will stop a drool in amazement
