Straights on NTC 400 Big Cam

The only difference you will notice is your head will roar for two days after driving your truck for one day. Then you will get tennitis and have loud whistling ears like I do because I drove a 318 Detroit with gutted mufflers and a loud NH 250 Cummins.

Those older trucks are loud enough anyway. Don't do permanent damage just because you like the sound. The truck with the loud Detroit I bought that way, but it sounded so good I didn't change it. It was impossible to drive with both windowns down. There was such a drone that way if would affect my vision.

 

My only recommendation is get as quite of a muffler with as good of a flow you can find. The last I bought I told the parts guy what I wanted. Turned out I got a straight through design which droned at certain rpms and the jake brakes would blast you out. Straight pipes will defeat the purpose of the dynamat you put in. I wish they had that stuff back in my day. A factory truck would drive you crazy with noise.

The truck in my avitar was all factory. NH 250 Cummins, weed burner with a turndown on the muffler. I added a foam blanket and carpet to the doghouse and insulation in the sleeper walls. Still when I got home from a trip my ears and head would roar for two days or more.

As I write this I have a screaming high pitched whistling in my ears drumming through my head. I have to sleep with a tv on to drown out the noise. If I'm really tired or sick the noise is so loud it's hard to hear anything else. Some days it's better, some much worse. Don't do this to yourself like I did.

Check the internet and try to find flow rates and db levels for different mufflers. I would give up some flow for quiet.

 

If u like straights just put in ear plugs

 

I love my straight's. No muffler included. As a matter of fact, I drive with the windows down much as possible, in winter, keep the heater high, summer, keep ther A/C on. But windows stay down 80% of the time. ..........."Did you say something, speak up"

 

I put straights on and top of stack to ground is 13'5, just go high as u can to keep noise away and youl b fine, also between my clamp and cab is a rubber mount so no vibration or drone stuff