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As Andy says I would stick to 50mm, possibly with 54mm cans if they come up. These pipes are good enough for nigh on 150 rwhp.....
In that era there was absolutely no way the Russians would have allowed the Americans to do a hoax like that.
Service Exchange Parts Derby DE74 2SJ
As mentioned earlier I would see about getting it repaired. Had a few done with no problems
[ATTACH] Full set of tools for sale in USA. Priced at around, $6000... For a Desmosedici El Toro.....