I was looking to buy this exhaust https://www.fmfracing.com/products/catalog.aspx?CategoryID=42. it does not say what the is db on it. iam running a wr400 with mods, does any one have experiance with this pipe and if you do can you tell me all about it. also could you guys be able to estimate the aproxiamte db it would produce on my wr400. thx alot.