It will be all noise and no go........:lol::lol::lol:
If you are looking for more hp you need to go from headers all the way back, and you might get 15 hp. New muffler is just noise no hp and makes to think you are going faster quicker.
Custom made is the only way to go. Looking at getting 2 side exits on my p38 (when I get one) £384 cat backs. You can make them yaself if you can weld. If you can weld SS then you can make an SS one. Wouldn't bother with SS it will get bent and battered offroad long before it rots away. Only going SS on p38 because it will be my shiny daily!
I've got a good place in mind if you're anywhere near Stowmarket. Did a great job for me, about £350, all SS, custom made. Looks the dog's dangly bits.