straight pipe question
 

the older diesels have no pollution devices in the exhaust. excepting a few years around 86 87.

none of the 123s did.

so yours needs none for pollution.

it will be a noisy bear though with nothing. the turbo motors are silenced to a good extent by the turbo.



tom w

I am on straight pipe, all I can say is that there has been a little gain in noise, it has turned more aggressive for sure, but the EGT also has gone down and the turbo response is way better.

A 77 is non-turbo so it's going to be EXTREMELY loud. The reason us turbo guys can get away with straight pipes is because the turbo works as a muffler through exhaust restriction and expansion.

I've got mine straight piped too, and have noticed the same thing. I like it.

At idle it resonates a bit, and outside during heavy acceleration you'd think a single engine plane was flying by. :D Inside its pretty much the same volume as with the exhaust system still on. On the freeway you can't tell, as the engine is loud anyways. :D ;)

I'm still waiting for my exhaust to fall off so I can just put a 2.5" pipe out the side