I went from stock to Nismo to FI w/18" res to Motordyne. It is worth the wait for the Motordyne.
It will not be as loud as a Tomei single. But it looks better (to my eyes) with the stock rear body kit and it is definitely cleaner sounding. The tomei is pretty raspy with test pipes at 3-4k rpm's. Motordyne is quiet under light load with a cool throaty noise and is very loud under WOT. It is named the shockwave for a reason. It is not just loud but makes excellent power gains as well.
W/ HFC
https://www.youtube.com/watch?v=sycWNs3lVic (Video gets better @ the end)
w/ A.R.T. Pipes
https://www.youtube.com/watch?v=MjJoe6qF9Xc - Interior sound with windows down... + a tunnel.
w/ A.R.T. pipes
https://www.youtube.com/watch?v=GtkmHhB_TDA - Exterior sound + a tunnel but not as aggressive driving as the interior video.
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Z1 Intake, U/L Plenum, Headers, Oil Cooler, Two Piece Rotors, SP Diff 3.54 FD, Semi Solid Mounts, Clutch + LW Flywheel + CSC Del || Uprev || A.R.T. Pipes + XYZ Mid Pipe w/ HFC || Tomei CBE || Nismo Sways || BC BR 12k/10K || SPC Arms || Dewla Shroud || Advan RSD ||