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100cell *might* cause problems come MOT time.
my piper 200cell was fine. twice.
not necessarily im afraid, there is no "fools" guide for this
mine was MOT'd at a VAG specialist established for 30+ years and they work on other tuned VAGs apart from mine. They knew how to test the cat, did, and it still failed
whole lot had to come off in the end and all welds checked and re-fitted and it only just passed right on the limit 2nd test.......