Kicking off Lethal Performance’s 2015 Mustang GT build with the basics
By Steve Turner
After waiting patiently for its 2015 Mustang GT to arrive at Weikert Ford in Lake Wales, Florida, Lethal Performance was eager to get on with the mods. If you know anything about the company, you know it is not shy about tearing apart newborn Mustangs in the name of performance.
Of course, even though they plan to get far more aggressive with the build-up of this 5.0-liter-powered S550, Team Lethal knows that all of its customers won’t be twisting the power knob to the insane setting right off the bat. As such, starting with the basic bolt-ons is always part of the plan with a Lethal project.
With that in mind we made the trip down to Power by the Hour in Boynton Beach, Florida, to document the start of this project. At least the start of the project from a performance standpoint, as you can see the company didn’t wait long modding the black GT with a striking matte-blue wrap highlighted by its signature skull and crossbones logo.
We arrived in time to document several steps in the process, but we are going to start where most people with new Mustangs begin. That step is adding a cold-air intake and a more aggressive calibration. In the case of the Lethal car, the company added one of JLT Performance’s tried-and-true CAIs, which had been paint-matched to the car’s wrap.
“We chose the JLT intake and custom tune as a starting place as that’s what most Mustang owners do to their cars shortly after purchasing them. These mods are cost-effective and provide a nice increase in horsepower and torque,” Jared Rosen of Lethal Performance said. “We know from all of our previous builds that the JLT intake not only looks the best but also performs better than the rest of the intakes on the market, which is exactly why we chose the JLT for our 2015 project car. That and the fact they’re made in the U.S. makes the JLT an easy decision.”
As with most CAIs on new Mustangs, the JLT requires recalibrating the PCM with a new mass-air transfer function to make the factory mass-air sensor measure the proper airflow moving through the larger-diameter mass-air housing. Of course, while you are in there, you might as well tweak the tune for maximum power, and that’s just what Lund Racing’s Ken Bjonnes did. You can see the dyno runs right here:
“We’re ecstatic with the results we got from the intake and tune. The JLT intake combined with a Lund Racing custom- tuned SCT X4 makes a hell of a combo. You can definitely feel the difference,” Jared added. “These new 2015s make some awesome power with just an intake and tune. On the ’11-’14s it would take the intake and tune plus an off-road pipe to make the same power. Just wait until we slap an exhaust on this car…”
So the Lethal S550 is off to a great start, but this build is just getting under way. In the near future, we’ll bring you the results of adding a Nitrous Express kit to the latest Coyote ’Stang, and then we’ll catch up with some other bolt-ons before things escalate with a full exhaust and a Whipple supercharger. This should be fun, so stay tuned to SVTP.