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Old 19-03-2008, 08:08 PM
NIX WRX NIX WRX is offline
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NIX WRX at standard level
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RMS (Butler still I think) is pretty quiet. Within legal limits according to Alex. And yes I have one of their diff-backs near new (did less than 500Ks) for sale.

Prodrive make a very quiet one (using one now), uses 2.5" piping.
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