The TeraFlex 2.5" Performance Budget Boost Lift Kit with Shock Extension Adapters is the most economical lift for the Wrangler JK/JKU. This kit is designed for you to lift your vehicle without many modifications. This kit will increase off-road performance. Several innovative features of the TeraFlex budget boost are found in the exclusive spring retention spacers that do not allow the spring to drop out during extreme articulation.