club.liberty.asn.au

Thanks guys tried searching but unsure of sizes

It's to have a 3 inch Y pipe to stock muffs joined together

Hope this makes sense

Any exhaust shop should have the gasket in stock.

Is it like a generic one ? Just as the y pipe is 3inch not stock

Exhaust shops make exhausts of all shapes and sizes, with flanges to suit said shapes and sizes.

Any reputable exhaust shop will have a thousand gaskets and will have what you need.