2008 MAZDA CX-7 Engine And Engine Coolingexhaust System Problems

I HAVE A 2008 CX-7 WITH A FAILED EGR VALVE. THEY REFUSE TO COVER THIS PART UNDER MY POWER-TRAIN WARRANTY EVEN THOUGH THIS IS CLEARLY AN EMISSIONS FAILURE. I HAVE BEEN DOING SOME RESEARCH ON THE ENVIRONMENTAL PROTECTION AGENCY'S WEBSITE AND IT IS MY UNDERSTANDING THAT THE VEHICLE MANUFACTURERS ARE REQUIRED TO DESIGN AND BUILD THEIR VEHICLES TO MEET EMISSION STANDARDS FOR THE USEFUL LIFE OF THE VEHICLE SPECIFIED BY LAW. UNDER SECTION 207 OF THE CLEAN AIR ACT, IF EPA DETERMINES THAT A SUBSTANTIAL NUMBER OF VEHICLES IN A CLASS OR CATEGORY DO NOT MEET EMISSION STANDARDS IN ACTUAL USE EVEN THOUGH THEY ARE PROPERLY MAINTAINED AND USED, EPA CAN REQUIRE THE MANUFACTURER TO RECALL AND FIX THE AFFECTED VEHICLES. MY CAR HAS LESS THEN 30,000 MILE ON IT AND THE ERG VALVE SHOULD NOT HAVE GONE OUT ALREADY. I SHOULD NOT HAVE TO PAY $712 TO REPLACE A...

WE PURCHASED THE VEHICLE NEW FROM A MAZDA DEALER. FROM THE TIME WE PURCHASED THE VEHICLE I HAVE NOTICED EXCESSIVE CARBON BUILDUP AROUND THE EXHAUST OPENINGS AT THE REAR OF THE VEHICLE. IT IS PROGRESSIVELY GETTING WORSE TO THE POINT WHERE THE CATALYTIC CONVERTERS ARE GETTING RED HOT. THE CHROME EXHAUST TIPS ARE NOW DISCOLORED DUE TO THE HEAT. THIS VEHICLE WAS CHECKED SEVERAL DAYS AFTER PURCHASE, WHERE ACCORDING TO THE MAZDA DEALER, THERE WERE NO ISSUES. WE MOVED, AND A NEW MAZDA DEALER IS SERVICING THE VEHICLE. TODAY, 03-18-09 IT WAS AGAIN CHECKED DIAGNOSTICIANS WITH NO ISSUES. WHEN THIS VEHICLE IS DRIVEN FOR APPROXIMATELY 100 MILES OR MORE THE EXHAUST SYSTEM GETS EXTREMELY HOT. IT IS THIS "LAYMAN'S OPINION" THAT THIS ENGINE IS RUNNING VERY RICH, "STARVING FOR AIR". I AM CONCERNED THAT THIS WILL EVENTUALLY CATCH FIRE FROM THE EXCESSIVE HEAT GENERATED AT THE CATALYTIC CONVERTERS AND TRANSMITTED...