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90plow

Exhaust question

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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.

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What law was passed banning straight pipes? What states does it affect?

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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.

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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...

Gregg

Sent from my XT1254 using Tapatalk

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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?

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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 by jessecam

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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 it

Sent from my XT1254 using Tapatalk

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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.

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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!

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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!

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