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I had my 06 Si in for the same noise. They first did the rev procedure to get oil in the lifters and kept the car overnight and the noise was back the next morning. # weeks later they called and asked for the car and replaced the lifters ( something about a heavier spring and bigger oil ports), 5 weeks later the noise returned and taking the car back and another wait and they replaced the head. After 5 months the noise has not returned to this point. I pulled the service order to check for part #'s and there was none listed on my invoice, called to see why that was, was told that due to the fact the work was done at their expense, parts #'s are not listed. What a crock of crap. Sorry I can be no help here.
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