Here is a much needed product we worked with our friends in Australia to develop . this is a brand new muffler assembly to fit the 1970-78 ATC90s . these are an exact copy to the original muffler right down to the spark arrestor and skid plate mount , main body was stamped just like OEM and the entire system was hand tig welded in a jig  they are pretty incredible and the best part is they are made 100% in stainless steel so no more rusted out mufflers these will outlast the machine , each muffler we hand test fit in a jig we built to ensure proper fitment and each will come with a new NOS head pipe gasket for the head