Glider engines are not meticulously rebuilt. The most prolific glider maker (Fitzgerald Glider Kits) is famous for its trashy rebuilds. Anecdotally: https://w

Glider engines are not meticulously rebuilt. The most prolific glider maker (Fitzgerald Glider Kits) is famous for its trashy rebuilds. Anecdotally: https://www.thetruckersreport.com/truckingindustryforum/threads/buy-a-glider-or-no-2021-illegal-or-not.1432921/ https://www.thetruckersreport.com/truckingindustryforum/thre... These rebuilt engines generate at least 20 times the pollution as emissions-certified engines: https://eelp.law.harvard.edu/2018/02/heavy-duty-truck-glider-kit-rule/ https://eelp.law.harvard.edu/2018/02/heavy-duty-truck-glider...