yes i do own a turbo SI but i have bronze HXs on it, but they do look like some RHs. as far as plugs i would go with some NGK 5 or 6 series but nothing colder than a 6. the golden eagle dowel pin kit can actually be use don the intake side if you turn the upside down. there i s abig debate over this cause no one knows which way they are supposed to go in!! thats why i havent finished my ls vtec yet. my manual says to go to 42lbs on the first torqing and then to 72lbs on the 2nd time around. you really might need to ge the block decked or have it looked at, you may have just passed some fluid thru the headgasket and jacked it up.......was it running hot at all? was there any radiator fluid in the oil???