Removed my collector box & down pipes 2 years ago ( including catalyser inside ) Replaced with down pipes/collector box from yamaha thunder ace orFZR 1000 , can't remember which . Cut thread lug off old box for sensor and rewelded to new one . Cut and rewelded outlet to muffler to line up correctly. Welded plate on where valve used to go on collector , Lined up at head ok .
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