I picked up an M3 backbox the other night for a measly, £40. I originally planned on using the 328 backbox I got earlier in the year, but the scrappies had butchered it getting the cats off.
My mate has an M3 and a 328 Touring and he says his M3 is a lot quieter, but I'm hoping its just the M3's mid sections. If it's not any louder then that's fine, I'll at least have something that looks good. Going to fab up a "Y" piece to join it to my single pipe mid section.


I gave it a quick spruce up with 400>800>1200 sandpaper and some autosol polish. Anyone got any other suggestions on metal polish?

I have a Cars & Coffee event next Sunday, then the car goes to the painters on Monday to have the arches, sideskirts and wings touched up.
My mate has an M3 and a 328 Touring and he says his M3 is a lot quieter, but I'm hoping its just the M3's mid sections. If it's not any louder then that's fine, I'll at least have something that looks good. Going to fab up a "Y" piece to join it to my single pipe mid section.


I gave it a quick spruce up with 400>800>1200 sandpaper and some autosol polish. Anyone got any other suggestions on metal polish?

I have a Cars & Coffee event next Sunday, then the car goes to the painters on Monday to have the arches, sideskirts and wings touched up.
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