We used to have that setup on the granny car. The bottom of the muffler was rusted away, letting the majority of the gasses out, but the pea shooter still sat out the back!

But seriously, I think it is a very cool idea.

These are all helpful ideas, but I don't understand how you plan on fitting the muffler on your sedan? The only way you could fit a muffler would be to bash in the wheel well or hang it really low.

Mmmmmm, Daveman I don't think I understand what you're trying to say/ask. The exhaust will be a 75mm straight pipe which will exit through this false muffler design, which will sit where the standard rear muffler used to. Only difference is the 75mm will exit underneath the muffler, out of sight, with the fake tip attached at the back like in the sketch. There is plenty space for a muffler there, at least the same size as the standard one...

Thus there will be no actual "working" mufflers anywhere in the main pipe. Noise should not be a problem, because you're pointing it at the ground, and not up or sideways to spread it's ugly little law enforcement calling wings...

There's a b210 two door sedan on youtube with an sr20det in it with exactly this type of thing on it. It's for sale too. Aussie car.

My sedan only ever had one muffler just behind the rear foot well. So you are saying you are going to dump the 3 inch pipe there and then run the stock pipe to the rear of the car?

I would suggest that it will be too loud. With my 3 inch exhaust with a muffler and a tip pointing at the ground it is too loud.

I thought originally you were planning on doing this trick to a muffler at the rear of the car where there is no room.

My old man in his younger days had an EJ that he used to street drag. He had a similar setup except that he used to have the branch near the fire wall. He had a gate valve with a long stem with the tap handle through the floor near the gearstick. He would close the valve for going past the constabulary, and open it up for draging. Similar to your design, but had a tap to turn it off and on!