3" downpipe on a N/A with already fairly small exhaust? And I've heard those are all good mufflers other than Corsa which many have complained is too loud. Would most of them sound pretty much the same though? And the only reason I wasn't going to keep the stock resonator was because I was going to replace to piping to, but do you think I should keep it? It just seems very small especially after the Y-split.