What you nead is some kind of windtunnel or some kind of gasometerBut the necessary mod to fit an oval section to the header of the system could adversely affect gasflow, it's hard to predict what would be effective and what might not.
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Go on Seb, lend him your pipes
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Hong Kong discs, I would not trust them. From what Iv'e heard they tend to not last long and warp easily. I would rather get good used OM ones. And if I could afford it Galfer's or Brmbo'sThought about buying some myself but unsure of this no brand name make stuff as far as stopping me at silly speeds goes...anybody tried them??
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(:-})