I have what appears to be a macs flow though muffler but I do not know what engine it will fit If anyone knows please let me know.It is 55mm between center to center of the bolt holes the exhaust opening is 35mm long and the height of the opening is10mm wide...Exhaust opening is oval.Will try to add pics.. Thanks in advance

Those flow through mufflers are pretty loud. If your flying field has any noise restrictions you might want to just keep it in a box.




Carl

My Flying field has no restrictions on sound.The question was what it will fit not how loud it was

I may be not be remembering correctly but I think these flow through mufflers were available for several brands of engines. Mine was for a Super Tiger 56 and I think I had one for a Fox60,

Thanks for the reply Rodney. I have compared to a ST 90 exhaust stack and the bolts holes are not as wide center to center So I think you are pointing me in the right direction as far as what engines to research Thanks Again !!!