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Old 03-24-2011, 11:24 AM   #20
supershaft
because I can
 
Joined: Sep 2010
Location: San Francisco Bay area
Oddometer: 8,796
Those CC Product's guides are great IF they don't come brand new with a ID that is already half way to worn out. Overall fit wise, I think you might be better with BMW guides. Personally, I would install CC Product guides undersized and Sunnen hone them to fit. I would machine a sharper oil scraper on them too. I think it does make a difference.

I have seen those seats get hammered PLENTY of times. I would most likely change the exhaust guides too but I wouldn't change them at 60k miles just because.
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