For all the exhaust gurus on the list, what the thinking of a "Y" inlet to a muffler ending in dual tips versus the stock dual inlet to the muffler? I have a muffler being mocked up by Brullen in T304 stainless for the 328is and from the cat back it goes into a single inlet just before the muffler. Glen Chow BMWCCC, BMWCA ------------------------------