A k&N air filter will help out alot...It,ll cost you about 35 or 40 bucks...Have two sets of tires and wheels also...One for wheeling and the other for the street(stock ones)....A header will also help if your state does,nt have smog laws like ours in calif....Is it an auto or a stick???If it is an auto then a front and rear gear change in the pinions will help two...The autos have 3.73 gears and the 5 speeds have 4.11 gears...With larger tires the gears make a world of difference....Shaving the heads of the engine will also help....You will get more power with more compression...Check out www.LCengineering for after market parts for your 4 runner....
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