90plow Posted June 10, 2015 Share Posted June 10, 2015 I straight piped my truck a few months ago and now I hear they passed a law banning it. I've been looking at internal baffles such as these. http://www.truckpipestore.com/mobile/5-x-60-internal-baffle-tubeWondering if these quiet the truck at all? Has anyone used them before?ThanksEric Quote Link to comment Share on other sites More sharing options...
dogg rescue Posted June 10, 2015 Share Posted June 10, 2015 I had 6" straights on my ch and decided it was too obnoxious and purchased baffles from Iowa 80, they reduced the noise significantly, and still had a nice sound. I would definitely recommend them. Quote Link to comment Share on other sites More sharing options...
68-f-model Posted June 10, 2015 Share Posted June 10, 2015 What law was passed banning straight pipes? What states does it affect? Quote Link to comment Share on other sites More sharing options...
Freightrain Posted June 10, 2015 Share Posted June 10, 2015 I'm pretty sure that every state has a statue that denotes that it is illegal to remove or modify any exhaust. It is just if your local Barney gets upset about it or not. 1 Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment Share on other sites More sharing options...
Underdog Posted June 10, 2015 Share Posted June 10, 2015 Ran straight pipes on my CX for nearly 10 years... In hindsight I'm surprised I never got bothered all that time... I hear that truck running around now and it sounds awfully obnoxious to me lol... Maybe I'm just getting older...GreggSent from my XT1254 using Tapatalk Quote Link to comment Share on other sites More sharing options...
68-f-model Posted June 10, 2015 Share Posted June 10, 2015 Just curious as I have 4.5" dual stacks I just put on to replace the original 4" single stack. I figured if once I got it on the road it was to loud I will just drop in a set of insert mufflers. I assume that those would meet the requirements? Quote Link to comment Share on other sites More sharing options...
jessecam Posted June 10, 2015 Share Posted June 10, 2015 (edited) was pulled over in northeast Michigan hauling corn with the neighbors Western Star that was straight pipe but he didn't say nothing about there being a law he said it was just too loud and it needed to be toned down. It was pretty loud. Edited June 10, 2015 by jessecam Quote Link to comment Share on other sites More sharing options...
Underdog Posted June 11, 2015 Share Posted June 11, 2015 Just curious as I have 4.5" dual stacks I just put on to replace the original 4" single stack. I figured if once I got it on the road it was to loud I will just drop in a set of insert mufflers. I assume that those would meet the requirements? Do you have a muffler on the truck now? I would think 2 stacks of larger diameter would tone it down compared to a single 4 inch pipe. seems like when I was a kid almost every E6 Mack had a single 4 inch straight pipe on itSent from my XT1254 using Tapatalk Quote Link to comment Share on other sites More sharing options...
68-f-model Posted June 11, 2015 Share Posted June 11, 2015 No, I don't have any mufflers on it. It had just a straight stack on it when I got it. Just sitting in the yard idling it is about the same if not quieter than my GMC's 8.2 diesel that has a huge muffler and an under the box exhaust exit.Once I get it on the road (a bit of work to do on it first) I'll find out how loud the dual larger stacks are. Quote Link to comment Share on other sites More sharing options...
68-f-model Posted June 11, 2015 Share Posted June 11, 2015 original exhaust Quote Link to comment Share on other sites More sharing options...
billengland1967 Posted June 11, 2015 Share Posted June 11, 2015 I used to run 6" straights on my old Western Star with a 525 Cummins for a few years without any problems. I am now considering running 8" on my cx Quote Link to comment Share on other sites More sharing options...
Murf915 Posted June 16, 2015 Share Posted June 16, 2015 I run straight pipes on all three of my R models, i wish i could rip all the emission crap off my new one and put straight pipes on that too! Quote Link to comment Share on other sites More sharing options...
90plow Posted July 30, 2015 Author Share Posted July 30, 2015 So I bought the quiet pipe from Iowa 80 that Dogg rescue recommended and now I'm getting an obnoxious whistle at full throttle. I have to take the exhaust apart again and figure it out but, other than that the truck sounds much better and is more enjoyable to drive. Thanks guys! Quote Link to comment Share on other sites More sharing options...
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