N2O (nitrous-oxide) will give you the most " bang for the buck" (most cost effective). For maximum increase in horsepower a fully built tubocharged, inter-cooled, nitrous-injected engine would be in order. If your looking for one component to get the most out of what you already have, and adding the "spray" isn't in the picture, most start with a cat-back exhaust system.
I am not the expert, but an ECU upgrade can add 10-15 hp. Then upgrade your air filter, and intake Then upgrade your exhaust.
the legend is faster no matter what its got more horsepower
what type of weapons
just over 200 hp
Fire & ice arrows
you need to upgrade the power gloves by getting the upgrade in a certain temple
As a Child you can earn a Slingshot Seed upgrade and a piece of heart. As an Adult you can earn a Quiver upgrade and a piece of heart.
The maximum amount of Rupees you can get in The Legend of Zelda: Spirit Tracks is 9,999 Rupees.
you will get 50 mpg more and at least 200 more horsepower
There are a few 3D games for the DSi. Legend of Kay is one, though I wouldn't actually recommend it.
Sail to A-3, Western Fairy Island. Pound the stake on the island with the Skull Hammer, then go inside to find a fairy fountain that will give you the upgrade. Note that if you already got the 60 arrow upgrade from here, you can get the 99 arrow upgrade from the fairy fountain at G-4, Thorned Fairy Island.
There is only 16 (in both quests)