Decat on e90 325i

Hi guys,

I was wondering if it would be worth it to decat my 325i? This will be purely an attempt to get better fuel consumption, nothing else. Worth?

If so, what exactly should I install (in terms of foolers/silencers/etc.) for the car to sound (maybe a tiny bit louder :=)) similar to what it does currently? Would the car have to be dyno'd as well?

Finally, where in the Durban vicinity would be the best place to get this done?