[orev]

5) Many owners replace the mufflers with “mufflers”, dramatically increasing the noise. Many of them sound like the engine is venting straight into the air with no sound dampening at all. You can hear these things at night easily a mile away, loud enough to wake you up or have to rewind if you’re watching something.

I’m not even talking about coal rollers, which are their own special breed. The noise makers are extremely common and seem to be getting more popular.

[mikrotikker]

Yes, can confirm. I have a 3" straight pipe direct from the turbo. The turbo acts as the muffler. I've heard a diesel without the turbo or muffler and it sounds like a bulldozer on meth.

However with just the turbo, at least on a 4.2L straight six, it sounds very nice (to me at least). Given the ability to breath and get the great away from the engine quickly the turbo can kick in earlier, mine is at 1500rpm or less. Gives more responsive power and cooler running. The turbo whistle sounds very nice.

[juliusgeo]

This is referred to as “straight piping” in the car community, and you are correct it’s basically replacing the entire exhaust system with a straight pipe from the engine to the back. Even very weak Honda’s can be absurdly loud with this.

[mikrotikker]

Its retardedly obnoxious without at least a turbo or resonator.