It depends. Do you want standard or sports? The standard Mild steel exhausts are quiet and less expensive or most sports exhausts are stainless, more expensive and give a throatier noise.
Cost saving, any pattern replacement from the likes of ECP will do.
If you want stainless and a throatier sound the cheapest is Toyosport.
I prefer the sound of the Satur Daytona, but other makes have their fans.
David