Exhaust Upgrade for 4.5 Patrol GU

I've just put a 3" onto my 4.2... Yes it does give you more power.. but eceonomy is only improved if you dont go putting your foot down a little harder bacuse you have the power to do so.. Having said that.. my range has gone from about 700k;s in the city to about 800... As far asa the noise you refer to.. it is only a slight differnecethat I guess can best be described as sounding like you need to go up a gear (it just sounds lie it's revving a little higher even though it's not.. (thats from in the cab anyway) From outside I cant say there is much difference at all