Characterizing the size distribution of raindrops is fundamental to a variety of applications. including radar-based quantitative precipitation estimation. Atmospheric radars or wind profilers can be used to measure the drop size distribution (DSD) by analyzing the Doppler spectrum. which is inherently linked to raindrop velocity. https://www.roneverhart.com/MagnaFlow-2001-2005-Honda-Civic-Street-Series-Cat-Back-Performance-Exhaust-System/