Boom Racing #BR921COMBO5S Performance Combo Package E Upgrade Set For D4 (Front Knuckles,Rear Hub Carrier,Bearing set) Silver for 3Racing Sakura D4 RWD Lightweight upgrade instantly enhances overall performance in handling and durability. Description: performance upgrade combo package for 3racing sakura d4 1/10 drift cars from boom racing. Boom racing performance upgrades include both high-quality aluminum replacements for the stock frp parts, as well as custom-designed carbon fiber chassis and upper deck plates for a unique look. This upgrade package is completely compatible with the stock parts in the sakura d4 kit. Fits both rwd and awd versions. Combo set contains:. Color: silver. Takes 7 to 15 business days by standard airmail shipping. 80% of packages arrive within 10 business days. Most packages ship within 12 hours. Please allow 1 extra day if order is placed during the weekend. Expediated shipping is shipped by dhl or fedex. Arrives in about than 2-5 days. Major cities will receive orders earlier.