2024 Ohio Code 1547.31 – Muffler or muffler system required – noise levels

2023 Ohio Code 1547.31 – Muffler or muffler system required – noise levels

2020 Ohio Code 1547.31 – Muffler or muffler system required – noise levels

2018 Ohio Code 1547.31 – Muffler or muffler system required – noise levels

2016 Ohio Code 1547.31 – Muffler or muffler system required – noise levels

2015 Ohio Code 1547.31 – Muffler or muffler system required – noise levels

2014 Ohio Code 1547.31 – Muffler or muffler system required – noise levels

2013 Ohio Code 1547.31 – Muffler or muffler system required – noise levels

2009 Ohio Code 1547.31 – Muffler or muffler system required – noise levels