I will play devils advocate here and add the Motordyne Shockwave to the list. I had the F.I with 12" resonators on my old car and the only complaint was the drone at highway speeds. Decided to try something different on the new car and went with motordyne. Significantly less drone and a completely different sound. Its hard to describe but I prefer it. Cold start is pretty tame surprisingly but above 3k is when it opens up. Only downside is the cost though. I haven't dynoed it but the car is more responsive downlow which is what I wanted. I never felt the extra power from the F.I. the service from both companies is perfect and both are amazing quality.
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'09 370 base - RIP
'09 370 Nismo - New track car
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