However, that does depend on how you plan to drive it. Yes, if you're going to rip it to redline at every stoplight, less exhaust restriction is the way to go. On street driven cars, it may not be.
Your argument sounds suspiciously like "no exhaust is the best exhaust" and completely disregards cylinder scavenging, etc. Instead, I'd like to say that yes, you can go bigger, but there's a sweet spot for pretty much any setup.
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