If its a short tight track then maybe a OS21RG is what you need. Only a hundred dollar engine, but well worth it. They have GREAT bottom end, and it will leave you with 200 to buy upgrades for the buggy. They are very reliable and hold a tune. On a tight short track they can hold there own no doubt. I run one and i keep up with some great engines if not beat them....Its just not a top end demon, but on low-end grunt its got you covered... Do a search and see for yourself..