Worth googling for exhaust manufacturers as it will be made in stainless steel and should be cheaper to buy. Your only other option is to ring some Daihatsu parts garages to see how much it is to get an off the shelf part. Failling that try eBay and look for IM or international motors who supply parts for most of the jap dealerships such as Daihatsu, Subaru and Mitsubishi. As they are always flogging off parts cheap. Good luck.