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Milltek backbox 20 people needed :)
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30th June 2017, 09:04 AM
Goran
Senior Member
Join Date: Feb 2011
Posts: 2,176
If you are going to ditch the middle box, I would stick with the 61mm pipes as before the mid box. No point reducing the diameter if you are doing straight through mufflers?
The stock diameter before the cats, and after the cats is 61mm or 61.5mm
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