alright, I have a 40 series on my truck right now..if I put a high flow cat on and a y-pipe behind the muffler to make it duals and then put 22 inch stainless steel exhaust tips on the back..will all of this improve the loudness of my truck compared to just the 40 series?

Thanks

 

im looking to do the same. have a 40 series with just the regular side pipe.. i want to either a. remove the cat completly or puta high flow.. i didnt think about the y pipe to make it dual cat back....good idea