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I really dont know much about plugs so i thought id ask some opinions.
My dailly driver 88 wagovan with d15b2 bottum and y7 head. Im getting about 220psi with the last compression test i did in each cyl. Ive been using the y7 plugs. Im just wanting max mpg from this with the dpfi.
Should i keep the y7 plugs or cuase they match the head or something colder?
 
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