Coupes are more prone to drone issues because it resonates off of the back window and into the cabin.
What you also need to look at is the rest of the exhaust system.
On my car with headers and DKF section 1 its WAY loud and drones about 3k rpm.
when pushing it beyond 3k it sounds amazing.
I'm sure a car with OE manifold and section 1, the RPIs will be great. (haven't experienced it myself)
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