hey, my name is manny and obviously new to site. Hoping someone can help me out here. I have 06 mastiff with 12,000 miles that has worn exhaust guides which I believe are due to the TP rocker box. Extreme guard is currently denying my claim saying that it is normal wear n tear. wondering if anyone has any info on these TP boxes that I can use. I've heard that it is a design flaw of the geometry of the rockers or possibly incorrect installation to boxes which caused rollers to be misaligned with with end of valve stem. I find it hard to believe that this is excessive wear n tear on a bike that is 2 yrs old with only 12,000 miles on it and has had all services. any help would be greatly appreciated.