kellyfrank Report post Posted July 6, 2012 I have a 1999 Dutch star. 4" end out nipple rotten need a new muffler. Getting confused-- should I go with a high flow or just a standard replacement, and where will I find one to fit the exact dimensions needed to back in the brackets welded to the frame? Share this post Link to post Share on other sites
wolfe10 Report post Posted July 6, 2012 I would start by getting the part number for the exact replacement from your chassis maker. With make and model, you can get the exact dimensions. You might also go by a shop that works on OTR truck exhausts. They could quickly tell you what you need. Brett Share this post Link to post Share on other sites
kellyfrank Report post Posted July 6, 2012 I have gone everywhere no one carries that size. Share this post Link to post Share on other sites
wolfe10 Report post Posted July 6, 2012 http://www.walkerheavyduty.com/catalog/docs/WHD08_Accessories.pdf Brett Share this post Link to post Share on other sites
kellyfrank Report post Posted July 9, 2012 They don't even carry my size. I am undecided between an AREO 4040 / xl or Donaldson muffler and it is going to be considerably smaller and basically flow thru. Share this post Link to post Share on other sites
desertdeals69 Report post Posted July 9, 2012 I am using the Aero short without the resonator for the last 8 years. A little louder than the stock muffler but since its in the back I don't hear it. Slight increase in fuel milage but it was combined with some other changes. Share this post Link to post Share on other sites
