Acceleration parts help to increase your acceleration statistic. A car with a high acceleration rating, Drift Shop items, and your level can also increase your acceleration statistic. Your acceleration statistic affects how quickly you can go from 0 MPH to your top speed. A high acceleration statistic is most useful in races with short straightaways and many sharp turns, deliveries, and OMD mission objectives with time limits. Players that frequently crash into things, lose a lot of speed while drifting, or drive off the road for long periods of time will find that a high acceleration statistic is more important to them. These players should look to increase their acceleration as much as possible. However, acceleration is generally regarded as slightly more important than speed and all players will find high acceleration useful. This is primarily because drifting causes you to lose speed, especially when drifting to make sharp turns. A part with a Turbo Launch effect can make acceleration less important to a skilled player, but Turbo Launch does not help a player that loses a lot of speed while drifting or driving off-road because the player is not stopped in these situations and can not activate Turbo Launch.
Store prices are what the Parts Shop will sell the part for. Resale prices are what the Parts Shop will buy the part for and are 5% of the store price, rounded down. Market prices for parts are not listed because the special effects of a part affect the price of a part too much. If you want to check the current market price for a part, you can either ask in the All channel or on the Ijji Forums. Parts without special effects are generally cheap and the market price of these parts can be determined by searching the name of the part in the Auction House. They are usually comparable to the resale price of the part however, and it is often more cost-effective to sell one of these parts to the Parts Shop and avoid the auction fee than to try to sell it on the Auction House, even if the market price is slightly higher than the resale price. Parts with a small statistic increase effect usually also apply under this general rule. If, including the effect, a part has a combined bonus equal to or less than the maximum bonus that a part of that level can have without any effects, it is no more valuable than a part without an effect. The only exceptions to this are non-acceleration parts with acceleration increase effects, parts with valuable effects that do not increase a statistic, and parts with two effects.