Steve Baur
Former Editor, Modified Mustangs & Fords
January 23, 2006

Fuel-injected Mustangs are nothing new for brothers Jonathan and Jeremy Haymore, as both have had more than a few of the potent ponycars and their father, Jerry, has owned two Cobras himself.

Jonathan, the older of the two, purchased a Reef Blue '92 GT at the tender age of 17, but sold it when this '93 Cobra became available. "My friend Frankie James has had eight Mustangs," he says, "and I told him that if he ever sold the Cobra, I got dibs on it first."

When Jonathan purchased it, the two-owner snake had logged 68,000 miles and had received a Paxton SN-92 ball-drive supercharger. Looking for a few more ponies through a camshaft swap, Jonathan's ill-fated choice of mechanic left him with spun main bearings and globs of blue silicone gasket maker clogging up the oil pump pickup.

A few months passed before he contacted Drew Davis from Rotating Dynamics in Winston Salem, North Carolina, who cleaned up the stock block and bolted in a Probe Industries 347ci stroker assembly. A Ford Racing Performance Parts X303 cam with 0.542-inch lift and 224 degrees of duration at 0.050 was installed, and the short-block was topped off with out-of-the-box Edelbrock Victor Jr. cylinder heads featuring 2.05 intake and 1.60 exhaust valves, along with a ported stock Cobra intake manifold.

While the powerplant was being put together, Jonathan took the opportunity to fortify the suspension with Steeda and HPM upper and lower rear control arms, Lakewood shocks and struts, and a Competition Engineering rear antiroll bar. HPM subframe connectors were welded in, and the 8.8 was overhauled using an Auburn differential, a 3.55:1 ring-and-pinion set, and Moser 31-spline axles.

With the HP Performance Stage I turbo system spooling up 9 pounds of boost, the 347ci powerplant makes a safe (18 degrees total timing) yet healthy 520 rwhp and 608 rwtq.

With the engine back from the machine shop, Jonathan hooked it up to a Tremec five-speed with a Spec Stage III clutch to transmit horsepower and torque to a pair of Weld Draglites and Mickey Thompson 28x11.50X15 ET Street tires. Draglite pizza cutters with M/T front runners point the ponycar down the track, while Jonathan uses the stock snake rims with Nitto 555R rubber for street duty.

The Cobra stopped the quarter-mile clocks in 12.10 seconds at 116 mph with this setup, but Jonathan was looking to pump up the boost. He purchased a Kenne Bell Blowzilla supercharger pullied for 12 psi of boost. "I was amazed by the torque and power this supercharger generated," he says.

And just like that, off came the Kenne Bell. A call to HP Performance netted one of its turbo-charger kits. Featuring a 60mm turbo and air-to-air intercooler, the kit delivered the low-end torque that Jonathan had become accustomed to with the Kenne Bell. With no tuning, it produced 565 rwhp and 632 lb-ft of torque at 4,200 rpm, with the pull being cut short due to a lean air/fuel ratio.

Mods to the snake's leather-wrapped, 76,000-mile interior have been limited to billet pedal covers and Auto Meter A-pillar gauges.

Jonathan installed Aeromotive's complete Mustang fuel system with 60-lb/hr injectors. He took the car to Randy Haywood at Haywood Speed Shop in Raleigh, North Carolina, where a safe, 9-psi tune with 18 degrees of total timing produced 520 rwhp and 608 lb-ft of torque. "The car drives just like a stocker, gets 17 mpg, and runs consistent 6.90s at 106 mph in the eighth-mile," Jonathan says.

He is quick to thank those who have given their time, support, and wrench hands to his ride, including his fiancee, Stephanie Fowler; his brother Jeremy; friend Frankie James; and his father. He also credits Drew Davis and Randy Haywood with providing a dependable yet powerful combination that generally keeps this Cobra ahead of his brother's.

Having done most of the mods on his previous Fox-body hatchback, Jeremy purchased his Terminator already hopped up with a Kenne Bell supercharger and 8.8 solid axle.

But sibling rivalry runs rampant in this family, and Jeremy regularly swaps top elapsed time Jonathan. Jeremy's Mustang enthusiasm began at age 16, when he purchased his first 5-liter from an older lady who had kept it bone stock. "It stayed stock for about a week before I began adding and removing parts, and it wasn't long before I added nitrous oxide to it," Jeremy says.

A new short-block and a Vortech A-Trim supercharger followed, as did an S-Trim upgrade. Jeremy's eventual experience with a turbo would not be as good as his brothers, as a blown head gasket prompted him to sell the Fox body and pick up an '03 Sonic Blue Cobra.

No hackery here--just tastefully mounted gauges.

Pulleys, an exhaust, and tune-up provided a potent 450 rwhp, but the insurance bill every month got the better of him, so the snake was sold and Jeremy purchased a '91 notchback.

Now, coupes are generally a hot commodity, and the supercharged 331ci motor made a healthy 515 rwhp. Taking a liking to his brother's newfound turbo power, Jeremy was ready to order a turbo kit for his Fox when he came across a Redfire Metallic Cobra. He sold his coupe to a close friend and slid the 11,500-mile '03 Terminator in his garage.

The factory-supercharged snake's previous owner, Joe Ritter, had already provided the Cobra with a bevy of bolt-ons, the most impressive of which is the solid 8.8 axle with 3.73 gears and Moser 31-spline shafts.

At 24 and 23 years of age respectively, Jonathan and Jeremy are some of the youngest SVT owners we've met. The brothers are information technologies professionals, and are used to people coming to them for answers. They obviously know where to find Ford high performance.

Like most stock Cobra clutches, this one bought the farm and was replaced with a Spec Stage III piece to handle the extra horsepower and bountiful torque from the Kenne Bell-boosted 281ci mill. Kaufman Motorsports in Dillsburg, Pennsylvania, worked its magic with Superchips Custom Tuning software. With a complete MAC exhaust, 4-pound upper and 3.25-inch lower pulleys making 20 psi of boost, the Cobra spit out 593 rwhp and 558 lb-ft of torque.

Steeda coil springs at the four corners keep the snake close to the ground, and Steeda aluminum upper and lower control arms send the stout power output to a pair of Nitto 555R Drag Radials mounted on the factory 17x9-inch wheels.

Future plans call for a heat exchanger upgrade and a different pulley arrangement to hopefully get the Cobra in the 615- to 630-rwhp range, as Jeremy is looking to stay ahead of his brother, who is working on a Dart 5-liter block and big boost.

"How rich I would be if I didn't have a Mustang," Jeremy says. Thankfully his fiancee, Courtney Flowers, is the understanding type--especially when sibling rivalry keeps pushing the performance envelope.