i just installed Denso plugs in my 4.8is, no issues. OE BMW plugs were there, had 92k on them...one was broken in 1/2 inside the boot: weird.

Mark

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'06 4.8is Imola Red
'91 911 Turbo
'86 928S Turbo
'82 928 Turbo Race car
'80 Porsche/Glastron Carlson CVX 20 Intimidator,
'74 911 RSR Tube-frame clone Race car