$14 dlls eBay 3D printed bell-mouth for 2015 Triumph Scrambler.
No noticeable noise increase. No noticeable performance improvements (without ECU remaping). Subjective engine hesitation at idle.

Used a free iPhone app for Noise Level Metering (not calibrated, only used for comparison purposes). Test results:

OEM Snorkel + Side Cover 74.7db at 1ft
OEM Snorkel, No side cover 75.1db at 1ft
Bellmouth, No side cover 76.5db at 1ft
Bellmouth + Side Cover 76.4db at 1ft

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