I've been riding for years and lurking these forums for just as long. I finally decided that being both older and 'old school' was starting to take its toll. I finally sold off my last dirt ride (a '91 XR600, Al Baker Edition) and jumped into a new '08 WR450F. I did my research before doing the deal, but it looks like there's no escaping the common issues......... TPS: Yep, even on the '08 the 1/4-3/4 throttle stutter is still a problem. Did the usual AIS elimination, grey wire, FMF pipe, dyno-jetting 3 times, etc.... Still does it! Did the searching and the choices seem to be MORE jetting experiments or possibly after-market ignition. I ride at elevations from 5000-14,000ft. Can anyone document the common resolve? Radiator Guards: Seems to be lots of thoughts on this one, but I really want a bullet-proof version that won't restrict airflow and will actually take a REAL hit and survive. I don't care if it takes me 2-days to install, provided it will work! Any recommendations/experiences on the 'high-end' versions for an '08 would be appreciated! Thanks in advance!