The Mattel (TYCO)  HPx2  Chassis (2005)

the Mattel Mopar set has new markings on the chassis, "HPx2". Mattel renamed the Tyco product line Mattel Electric Hot Wheels and renamed the Tyco 440x2 chassis the 440x3. The new 440x3 chassis is essentially the same as the original 440x2 chassis with the addition of a small capacitor to reduce radio frequency interference to better meet European RFI regulations."

I had already noticed that the HPx2 chassis does not have this small capacitor. and there are no quality dots on the chassis bulkhead. Armatures are low quality.