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04-12-2007, 08:50 PM
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Join Date: Apr 2005
Location: Geelong
Posts: 1,407
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The outlets on my Head are about 40-41mm thou my extractors are only 35-36mm, just wondering if the step inside would be blocking the exhaust flow to an extent enuff to lose power?? turbulence inside the head from a 5mm lip all round. Im looking to get the paccies now as there bigger 4499's
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Extractor Q's
Threaded Mode