Iridium plugs best replacement.. Absolutely no need to change OEM plugs that came with your car they are infact the best. You will not get any improvements what so ever by swapping them out unless of course they are corroded. As for MSD ignition thats impossible you dont have a distibutor on the D engine we have coil packs. There is only one upgrade and that requirs you to spednd 500$ for new coil packs. This is an upgrade that does nothing for your engine and in fact is a waist of money. Its more for engine bay upgrades if your car was to be put in a show. All it does is basiclaly make people go " WOW thats cool he spent alot of money on that".
check them out
http://www.ignitionsolutions.com/