4" BASIC SYS W STEALTH 14 18 GM C K1500 P U W OE ALM OR STMP STL UCA. 2011 nissan frontier pro 4x esi9989812 Highly visible from other vehicles BCJH_760048 19 Highly visible from other vehicles thus reducing chances of rear end collisions High Performance Motor: Ducted IP55 sealed brushed DC cooling fan and anodized aluminum motor mounts keep this unit running cool and continuous with a 100% duty cycle Fabtech's new 4in crossmember systems utilize their proven heavy duty construction and design features found in their 6in systems but with less lift for use with 33in tall tires These 4in systems feature high arched lower control arm crossmembers constructed of 1 4in thick steel for maximum strength