LF：aftermarket exhaust for f80

[RevNev]

Originally Posted by X.X.I.V

So can we have a decent muffler shop add the packing to get a deeper sound?
Has anybody be done this or nip and tick the stock that's sounds deep and low ?

I'll have mine finished soon and we'll see what it sounds like. I made the resonators and they're 12" long and 4" round packed with stainless wool. 2 replace the cats and the other two replace the resonator with the rear ZCP muffler stock. The midpipes are joined together like an X-pipe after the bend before the cats but the 4 resonator setup is ultimately for catless downpipes.

With stock (catted) down pipes, I'd be inclined to pipe the secondary cats and replace the resonator with the two packed resonators. The more rearward the packed resonators are, the smoother the note at the tailpipes.