So, I'm nearing completion of installing the 4bt in my GMC 3500 Crew Cab, and I'm looking for advice for exhaust systems. I'd like to go with a single 4" stack with a turnout from somewhere like dpppower.com, but I'm not sure what to do about a muffler. Anyone running stacks with a muffler to quiet things down? It needs to be wife and children friendly, as we want to be able to ride in the truck for long periods without being drowned by the exhaust. Are the in-stack mufflers any good, or should I look for the underbody ones? I don't have _that_ much room since it needs to stay between the cross members.
Don't get me wrong, I love the whistle and grumble of the 4bt, but after 4-5 hours, it can get old. To keep the interior noise down, I put the asphalt sound deadening mat on the floor, then a layer of jute, then another layer of jute that was attached to the new carpet, and then finally the carpet. BIG difference between that, and the bare floor.
--Mike Jackson
Greenville SC
1993 GMC 3500 Crew - ex 6.5 and 454 (PO) - 4bt, cpl 858, dodge nv4500 with gas input shaft, custom pilot bearing, all autometer ultralite gauges, no pyro or boost gauges yet (soon)
Don't get me wrong, I love the whistle and grumble of the 4bt, but after 4-5 hours, it can get old. To keep the interior noise down, I put the asphalt sound deadening mat on the floor, then a layer of jute, then another layer of jute that was attached to the new carpet, and then finally the carpet. BIG difference between that, and the bare floor.
--Mike Jackson
Greenville SC
1993 GMC 3500 Crew - ex 6.5 and 454 (PO) - 4bt, cpl 858, dodge nv4500 with gas input shaft, custom pilot bearing, all autometer ultralite gauges, no pyro or boost gauges yet (soon)