I'm new to the LX platform. I'm looking at 20in. Charger chrome clads for my '08 Magnum(SXT) and using my stock 18's for winter. The 20's come from an '07 model, do I need to buy new TPMS valves to make these work on my '08...did they change the Mhz reading for '08. Can you disable the TPMS system and use regular valves or use the '07 TPMS that come with the wheels I'm looking to buy? Can I run the wrong TPMS or will I get warning lights on the gauge cluster? These TPMS valves really suck when trying to buy new rims...

How do I know my '08 Magnum with optional 18's is equiped with TPMS? Can you tell by the really skinny odd looking valve stem?