I'm in a FX45 running a true dual Dr. Gas x-pipe and spin trap muffler set up! Since your in a FX35 check out Spintec. Also look on YouTube. There's a g35 running spintecs. This may give you an idea of what your FX will sound like since the engine is pretty much the same. Spintec are Dr. Gas copy cats, as Dr. Gas is no longer in business, as he's retired. But the spintecs sound good too!!! They make custom mufflers as well. I'm gonna go with a set myself. I want a single spintrap in the spintec as my Dr. Gas has 3 inside the muffler, plus spintecs for me would be a little lighter out back! Another option is Borla XS as mid muffler then straight pipe. Lot of the g37 guys are doing this. Lastly... lol can't and don't want to spend a ton on piping that lives under the whip. Who wants to get up under the ride and polish the exhaust all the time!!!