The Denver-area roadcourse, Second Creek Raceway, was recently granted one more year of operation before its final use permit expires. Although there are no new dB limits at trackside, we must meet the local 'nuisance ordinances' and all cars must have "mufflers". I'm curious as to what experience is out there re. mufflers for FF's, what other tracks require mufflers as a blanket rule, and what your recommendations are. Thanks in advance.