12th August 2010, 07:30
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#3
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Fellow Member (>400)
Join Date: Sep 2008
Location: Eugene, OR
Garage:
black e60
Thanks: 10
Thanked 58 Times in 44 Posts
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NGK makes a plug LKR8AP, around $12 each on the internet. I believe this is the OEM plug for the M5 (press release here: NGK: NEW NGK SPARK PLUGS FOR THE BMW M5 WILL ALSO ACT AS SENSORS )
NGK also makes a racing plug that will fit, R2556B- in heat ranges of 8,9,or 10 for close to $100 each.
In fact I don't think anyone other than NGK makes a plug that fits the M5.
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2006 M5 black/black
1999 A4 1.8 winter beater
1989 Isuzu Impulse 2.6L turbo-397hp/414tq at the wheels
1984 1-ton van
1989 Toyota PU 3RZ swap-on hold, stock 22RE in the meantime 
1994 Park Avenue with overdriven Eaton
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