Does anyone know of a muffler that's more like a saito or OS 4-stroke muffler where the header pipe screws inline with the muffler rather than off to the side like the YS stock one?? Idealy I'd just use a Saito or OS muffler.... but does anyone know what size has the same threads as the YS 63??? I've only got a saito 180 and an 80 to comapre it with and both are too large.

Thanks in advance