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John Goreham Contributing Writer, GM-Trucks.com 9-12-2018 Let's face it. The Bison is a Colorado ZR2 with skidplates, better bumpers, and the cool snorkel. Except you can get the snorkel just as easily on a ZR2 or even a base Colorado. Chevy isn't supplying them from the factory. To have that cool appendage, you have to install it yourself or have someone do it for you. Cutting out the catcher's mitt-sized hole in the fender is one thing, you can always replace a fender, but drilling into the A-Pillar may seem scary. That A-Pillar is responsible for a lot of safety functions as well as being a tougher part to repair if need be than a removable fender. To drill or not to drill, that is the question. It is also a question we put to the Facebook Chevy Colorado ZR2 club. 77 of the 144 respondents said "No F'ing Way!" to drilling into that particularly sensitive spot. To see if the A-Pillar is off limits, we reached out to the Steel Market Development Institute (SMDI). These are the folks who help automakers to develop the exotic steels now used for lightweighting and strengthening key parts of trucks and cars. First, we asked SMDI what exactly the A-Pillar in a Chevy Colorado is made from and how it is made. They told us, "A-pillars are typically designed with 3 layers of sheet metal. An outer body side panel which is the painted exterior surface, and an outer (middle layer) and inner (interior to the passenger compartment) A-pillar structures. The outer panel is made of mild steel and is mostly to cover the structure of the vehicle and contribute to styling. The two structural pieces for the A-pillar are made of ultra-high-strength steel (UHSS) and have tensile strengths greater than 1000 MPa. The outer is a press-hardened steel (PHS), also called a hot-stamped steel. The inner is a multi-phase grade (stamped at room temperature). These grades are 4-6 times stronger than the mild steel of the outer panel and deliver exceptional performance in strength and resistance to intrusion (bending or crush in a collision). These grades also deliver efficient designs of the A-pillar in that higher strength allows for a thinner section design (over lower strength materials such as aluminum) which gives better visibility to the driver." SMDI reviewed the video of the install from AEV, the supplier of the snorkel. We then asked them if they thought the drilling was any kind of concern. SMDI replied, "The way this process is shown in the video is more than adequate to attach the snorkel without compromising the performance integrity of the A-pillar. It is attached directly to the outer panel and does not disturb the load path performance provided by the outer and inner structural pieces." So the experts say "full send!" Send us images and video if you do an install of your own. We'd love to do a post showing them off. Here's how to get the snorkel kit. Image note: Component images are slides from the 2015 Great Designs in Steel presentation by Wendy Malone (GM) on “The All New 2-15 Chevrolet Colorado and GMC Canyon Cab Structure.” Courtesy of SMDI.