If you want quiet locate the muffler as far back as possible and install a crossover, I ran the exhaust temporarily until I could get it on a lift and had the mufflers under the cab and dumped just before the rear wheels and it was way too loud in the cab, now I have a crossover just after the transmission crossmember and mufflers located just behind the cab with 90s behind the rear tires. Now when we built this on a lift we left out the crossover due to time constraints and added it next day, and it was noticably quieter with the crossover. I used the dynomax kit for our trucks (2.25") but had to modify it to work with my headers and I used thrush welded mufflers.
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