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I don't know which one is best but I know this for sure. The exhaust that i just put on, my car now is more like a sport car. The sound is awesome, they good at any rpm, they have that deep notes like Ferrari and Porsche carrera 911 ( my friends said) and also many people gave me complement.
Thats interesting because I have no droning at all with my Amuse dual. It certainly is louder at certain rpms than at other rpms but no droning to speak off. I also had a Invidia (on a GSR), that drones. You get an almost painful resonance that makes the ears ring. The Amuse is fairly loud (any louder and I would not be able to drive comfortably on a daily basis) but again it does not have a resonance. It is about the only aftermarket exhaust that has a helmholtz resonator (like the OEM) that is designed to reduce and/or eliminate resonance. JL9000, I wonder if you are getting resonance due to headers and/or intake mods? I modified my intake resonator box and get a liitle resonance from the engine intake now.
I have J's racing. i love it. havn't done a dyno yet but it should make some power. very loud but in my opinion it sounds very nice. also light 13lbs i belive. here are som pics. oh you can pick one up for around $700-800