KJ Jones
March 1, 2013
Photos By: KJ Jones, Drew Phillips

2013 Ford Mustang GT

Once again, the Coyote is in the Bolt-On Battle mix, as cylinder heads on the '11-'13 Mustang GT's powerplant certainly qualify Ford's hottest 'Stang for participation. Lesa Alaniz served up her brand-new, '13 Pony for the upgrades. When we say new, we're talkin' only 3,610-miles new, so in a bit of a side study, we were also interested in seeing how Lesa's Pony stacks up (one-to-one) against Saoud Aseeri's '12 GT, which had 17,285 miles on its Coyote in our first Battle. Baseline-for-baseline, the "broken-in" 'Stang had the slight edge. However, as you'll see by comparing final numbers for both thoroughbreds (see "Main Event" on page 52 of our October '12 issue for Saoud's data), Lesa's Pony eeked out a little more steam with the bolt-ons.

On The Dyno

Baseline TB EXH CAI Tune Baseline vs. Tune
RPM HP TQ A/F HP TQ A/F HP TQ A/F HP TQ A/F HP TQ A/F HP TQ
4,000 266.96 350.52 12.72 273.7 359.36 12.42 275.52 361.76 12.38 284.70 373.81 12.03 286.44 376.09 11.72 19.48 25.57
4,500 314.22 366.75 12.81 319.4 372.83 12.51 322.14 375.98 12.63 330.05 385.22 12.19 335.60 391.69 11.80 21.38 24.94
5,000 336.18 353.13 12.79 342.1 359.33 12.60 344.02 361.36 12.66 355.08 372.99 12.14 364.69 383.08 12.00 28.51 29.95
5,500 357.30 341.20 12.66 363.9 347.50 12.51 371.96 355.20 12.52 381.64 364.44 12.15 392.18 374.51 12.34 34.88 33.31
6,000 361.91 316.80 12.46 368.3 322.35 12.44 377.58 330.52 12.47 387.16 338.91 12.40 396.72 347.27 12.47 34.81 30.47
6,500 n/a n/a n/a n/a n/a n/a n/a n/a n/a 400.72 323.79 12.56 409.15 330.60 12.62 n/a n/a

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2013 GT Parts List
1) BBK 85mm Throttle Body (PN 1821; $469.99)
2) Flowmaster After-Cat Exhaust System (PN 817587; $787.66)
3) JLT Ram Air Intake Kit (PN CAI-FMG-11-P; $299 + $50/Race Red paint)
4) SCT SF3 Ford Flash Tuner (PN 3015; $380)


Playing the Percentages
All of our Bolt-On Battles center on learning which Mustang-engine platforms are the most-receptive to popular, basic bolt-onsat the percentage level.

To do this, the following formula (which is based on each group's baseline and post-tuning power/torque numbers) is used:

Step 1: Subtract baseline power/torque value from final power/torque value
Step 2: Divide result by the baseline power/torque value (will be a decimal number)
Step 3: Convert that number into a percentage by multiplying it by 100, and then adding a % sign

In this exercise, the Battle and the overall war was won by the '13 Mustang GT, which we sort of expected would be the outcome of this round. The Coyote's overall efficiency in stock trim, which comes largely by way of its cylinder heads, makes it a hard package to beat when it comes to adding the basics and gaining more (total percentage) horsepower and torque.

Interestingly, the second-through-third place picture is somewhat cloudy. Ranking the '97 and '01 Cobras and the Mach 1 really depends on how you personally rank or appreciate horsepower and torque, as the performance results for their Four-Valve engines are split..

Four-Valve Mustang Power Increase Torque Increase
1997 Mustang Cobra 5.08% 2.51%
2001 Mustang Cobra 4.56% 2.87%
2003 Mustang Mach 1 3.26% 5.70%
2013 Mustang GT 12.37% 7.15%