Horizontal muffler can I just straight pipe it and pass dot?

@NorthernMechanic

 

Yeah you could make it a grass burner with a muffler and be just fine. Or quit cheaping out on the flex pipe you're buying. Pay a few dollars extra for stainless flex and your annual rot problem will disappear.

 

Straight piping I don't believe is considered tampering with emissions equipment so long as they aren't catalytic mufflers that you're removing. They can possibly fail your truck for not having a muffler though. Some places consider the turbo as a sound dampning device and others require a muffler. Your best bet would be to install a short, horizontal muffler or resonator under the cab and to make sure that the exhaust is not exiting under the cab. A carbon monoxide alarm would be handy as well since the exhaust has a greater chance of entering the cab as well.

 

@Ruckie you still in nj?
@NorthernMechanic nj does visual opacity tests as well as sniffer tests.
Only place I ever got checked. Visual only and I only blipped it to 1200 bc I claimed I had a muffler and I don't think that would have been believable if I kicked it hard..

Idk how much a muffler really catches smoke, or affects a test like that- but you tell an inspector you got straights...seem like an easy way to earn a fine to me.....