Since day one, the originally equipped 4.8L V-8 under the hood had been running with a K&N cold-air intake and a Magnaflow exhaust as the only modifications for power and sound. More power was definitely desired, so the engine was left in the capable hands of Flaco, at Flaco’s Performance and Tuning in Pasadena, Texas. While there, the engine received the parts necessary to upsize the 4.8L into a more powerful 5.3L. Although the heads were left stock, new valve springs and stronger pushrods were assembled to work in harmony with the .508-inch camshaft Flaco installed. For some entertainment, a 150hp shot of nitrous was included in the engine transformation. Hooker headers flow into the Magnaflow after-cat exhaust, and when the hammer is dropped, the fully tuned, nitrous-injected Sierra came out of Flaco’s shop with 469 hp and running the quarter-mile in the low 12s at 128 mph. A shift kit and higher stall converter were slipped in the 4L65E to manage the newfound power put down through 4.11 gears and a posi.

Not content to listen to all of the new horses galloping under the hood, a completely rocking sound system was stuffed into the tight confines of the standard cab. Most obvious is the custom-molded dash holding the giant touchscreen controlling the system visuals. A Pioneer head unit molded into the custom center console controls the system’s sounds. Power Acoustic amplifiers route energy through Alpine 5.25 and Infinity 6x9 component sets with deep tones firing from the Kicker Solobaric subwoofers behind the seats in a blow-through box. Jet Green covers the majority of the smoothed plastics with the lucky polymer parts being covered in black alligator skin. The spiny skin coats the A-pillars, door panel tops, center console lid, and factory bucket seats. A slide-back moonroof cut through the suede-wrapped headliner allows the warm Texas sun to shine in. Finally, a billet Specialties steering wheel adds a bit of shine to the expanse of green and black.

With the Alaniz brothers roasting those huge rear wheels with ease and the Sierra looking good, they made the long drive to Las Vegas and debuted the truck at the SEMA show. Even though the build was well received, Ivan and Nico still weren’t content. Attention was turned back to the appearance department, and Da Shop sprayed silver flake flames from the Yukon nose right back onto the bed. Now the GMC screamed custom and in the Texas sunshine it looked better than ever.

With his long history building custom vehicles with his brothers in Ground Zero, Ivan has completed what we think is the best of his labors. After three different colors on the truck, two sets of custom wheels, and the lengthy list of modified body panels, Ivan still has one regret. Apparently 469 hp on the spray is just not enough for him. A change may be blowing in the wind again, and rumor has it the truck will be even wilder in 2012. We’ll be awaiting the next iteration if it follows the same pattern of bigger and better modifications that have already been shown. Let’s keep the party goin'.