Bill,
These Flowmasters (don't cringe) have the same Laminar Flow as the Sidepipe mufflers they used to make. Moderate sound (50s style). 4" tall case. avail in 304 and 409 SS. THe Moderate lvl versions are, Case:18"LX5"WX4"T, (overall length 24"), 2.00-2.25-2.50 dia.+ no packing to blow out.
https://www.holley.com/brands/flowma...r_hp-2_series/