Drop the Suitcase
Lethal Performance revs up the sound of its new GT with a resonator delete
By Steve Turner
Photos by Steve Turner and courtesy of Lethal Performance
When Ford designs a new Mustang its NVH engineers walk a tightrope between meeting the company’s noise, vibration, and harshness standards and giving the pony car a personality that befits its performance. For enthusiasts like us, the cars are almost always too quiet.
Sure there exceptions like the GT500KR and the Boss 302 with its side-exit pipes opened up. However, in general, we could always use a few more decibels exiting the tailpipes. That said, it might not immediately be in the budget for you to install a complete aftermarket exhaust on your brand spanking new Mustang.
Knowing this is the case, our pals at Lethal Performance created a simple and affordable delete kit for the resonator in the factory exhaust. Known in enthusiast circles as “the suitcase,” this part of the factory exhaust is not only heavy, but it soaks up a bit of the sound exiting the tailpipes.
“Not for nothing, but the car is really quiet from the factory. As a Mustang enthusiast, I like my cars to have a louder, more aggressive exhaust tone,” Jared Rosen, of Lethal Performance, explained. “Usually we would design an off-road midpipe to delete the factory cats, but with the design of the new exhaust system on the ’15s a bolt-on off-road pipe was out of the question. That’s because the factory cat on the driver’s side is now built into the manifold where in the past it used to be built into the midpipe.”
“In addition to that, we looked at the stock exhaust on a lift and noticed several things that we believe could be improved upon,” he added. “For one there are a few sections of the factory piping that neck down to 2 inches. There’s also that huge resonator after the cats that just screams ‘cut me out.’ With that said we took a stab at removing the neck-downs and resonator to see what type of results we would get.”
So if you are looking to drop a little weight and add a little sound, follow along as we show you how the crew at Power by the Hour in Boynton Beach, Florida, dropped the S550 suitcase off at the curb with the resonator delete.
“Although there weren’t any performance gains with the resonator-delete kit, the sound of the car was greatly improved. With the resonator delete, the car sounds like a Mustang should. It has a throaty, muscle-car sound, and has no drone whatsoever,” Jared said. “Not bad for a $299 upgrade compared to what some of the other axle-back/cat-back kits cost. Just take a listen to the comparison video and you’ll see for yourself that the delete kit is for sure a winner.”