340R Exhaust System
I've made several different systems depending on how much NOISE the owner wants to make. The image shows a 6"diameter (152mm) silencer. With a de-cat pipe, it's a great sound but LOUD.
If you want a quieter exhaust and need to meet a db/noise limit, you'd be better with the 7"diameter (178mm) system - it's been the most popular choice.