As above, you can, but you need to buy the new gears, plus parts and labour costs will be pretty huge. I see a few options: Put up with it and loose a little bit of money on economy Sell up to a Sportivo, get that extra gear and more powaaaaa for what, like 6k cost, which you wont really make back in economy but maybe in fun. Sell up to a brand new small car (new rolla even), new cars are so freaking economical now Sell down to a 1JZ Supra and enjoy getting maybe 350km to a tank (70l, maybe 5l left). Pocket a few k and burn it in fuel. so you cant just change the stock ratios? prolly better to just buy a mr2 :D