2006 ford mustang v6 4.0 maintenance/improvement?

I have 2006 ford mustang California edition and am looking for advice. What should I do to properly maintain it and keep it in great shape? I would also like to improve it as much as possible so that it can get close to a v8. What should the first few mods be? I know a cold air intake, headers, throttle, but what more is there and what order should I add these in? Any advice would be appreciated thank you

Hi Now the volkswagen so called problem has come to light. Now the engine modifications will be looked at. So you can for get mods like cold air intake modifies exhaust systems as all produce high levels of Nox gases.

"I would also like to improve it as much as possible so that it can get close to a v8. What should the first few mods be? I"

Supercharger. Bolt on's aren't going to get you anywhere close to the performance of a GT.

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