Lexus will not cover "non-Lexus" parts. But at the same time they can't tell you what you can and can't do to your car. Some dealers will turn down claims just because it is easier. Some dealers will work with customers if that dealer installed aftermarket parts sold and supported by that dealer. We try to be reasonable, if the aftermarket part is not a direct result of whatever warrantable condition might be happening then we fight for the customer. Makes sense, right? This silver 2009 we have has been driven for about 800-1000 miles with intake and exhaust on it with NO Problems. All we did was make that big air pump under the hood breathe a little better.FChampOH is the Joe Z exhaust and intake covered under the lexus warranty?