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Part 5 of our A5 BuildWe are now on to the Exhaust System. This is a common modification our customers do, both from a performance, aesthetic and acoustic perspective.A quick look at the stock exhaust, it is 65mm (~2.5") to 55mm (~2.15") and has 2 small boxes right at the back, but is still pretty quiet as the DPF is also a large silencer. It also has twin 3" Rolled Slash Cut Tips as standard. The standard grade of stainless is very poor and we see a lot of cars with rusty ex …