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Just do it the easy way, and the next time we have a meet, get Alex to take out his silencers and then we can put your cars next to each other and take one vid.
this is coming from someone who has not owned or heard any in person....but:
stillen i think seems to be the quiter of that bunch.
the FI depends on which one...the regular one i remember someone made a thread that they just installed it and it was actually quiter than he expected, so i guess its not that crazy loud. the FI CF is louder than the FI regular.
and GReddy is most likely louder than all including the FI CF.
i love the way the FI CF sounds...very deep sounding exhaust tone.