I decided to do another OEM exhaust mod on my standard back box of my E90 M3.

When I got the car I did the 2 pipe mod straight away, I then fitted test pipes and it was to loud , after this I purchased a second hand middle section with sports cats and silenced primary decats. This then made the car sound stock again so the only thing left for me to do was the 4 pipe mod.

I cut apart my back box again and blanked of the remaining silencer sections! The results Of which I’m pretty happy with.

Working on a car whilst on lockdown has its own challenges but luckily I had enough stuff lay about to do the job.

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