The Envoy XL comes with a six-cylinder Vortec 4200 engine and a four speed automatic transmission. Customers have a choice between two-wheel and four-wheel drive. Packages available include the SLE, SLT, and Denali. Each trim add increased numbers of features and the Denali package includes a 5.3-liter V-8. Because it's longer and heavier, the XL is reported to not handle as well as the Envoy nor feel as reassuring as the wider GMC Yukon. However, the Envoy XL comes with increased usability and versatility compared to the GMC Envoy.For 2006, the Envoy XL comes standard with StabiliTrak electronic stability control with Proactive Roll Avoidance, GM's electronic handling system for safety.