Our extensive study of '11-'12 Mustang GTs has taught us a great deal about the Coyote engine's preferences, when it comes to making performance-oriented changes. We've learned that Coyotes are heavy-breathers, and the engines thrive on intake-air improvements such as adding aftermarket induction upgrades and variable-cam-timing tweaks.
Recent 5.0-themed projects also have confirmed there are benefits in making similar adjustments on the exhaust side. Tests show that modest-to-monster power and torque increases have come from installing various exhaust bits on 'Stangs with bolt-ons or power adders.
Kurt Schutt owns an '11 Mustang GT that falls directly in line with the type of Pony we were looking for when MBRP Performance Exhaust presented us with an opportunity to test its new long-tube-header system for V-8-powered GTs. Kurt's steed is all-motor-for now-and despite having several nice appearance treatments and a cold-air-intake system, the car is otherwise stock.
The twin-post hoist, tools, Dynojet chassis dyno, and talents of GTR High Performance were called on for assistance with getting this project done. And, as a cool change from the "norm" in PCM calibrating, the all-important tuning for this effort was handled over the Internet by Chris Jones of Blow By Racing in Boca Raton, Florida.
For details on how it was done, and of course, how MBRP's 5.0 exhaust performs, read on.
Horse Sense: Are you an '11-'13 Mustang GT owner? Do you plan on being one at some point fairly soon? If you answered yes to either of those questions, please visit us online (www.50mustangandsuperfords.com, www.facebook.com/50mustangmag, twitter.com/#!/@FiveOhMag) and let us know which mods you're considering for the new Pony, and how soon after acquiring the car you will begin making changes.
Our experiments with '11-'12 Mustang GT long-tube header exhaust systems typically are per
We decided to install MBRP's catted H-pipe on Kurt's Pony. The tube (PN S7238409; $1,206.4
Despite their OEM stainless-steel manifolds that closely resemble short-tube headers, exha
Finally, the MBRP Street Cat Back Kit (PN 7210409; $901.45) is the finishing touch on our
After removing items such as the battery/battery tray from the engine compartment, and the
We were anxious to give MBRP's long-tube headers (PN S7230304; $1,080.45) a workout. The T
Header removal (stock) and installation cannot be efficiently accomplished without raising
Eddie pulls the driver-side exhaust manifold down from the engine block, and then repeats
MBRP provides all of the clamping hardware for the entire exhaust system. After installing
Stock exhaust manifolds are secured using studs that are secured in the engine block. MBRP
The MBRP long-tubes really look good on the underside of Kurt's '11 GT. Notice how well th
Extensions for wideband O2 cables are provided with MBRP's headers and H-pipe. However, we
Here's a comparative look at the ports in a Coyote Mustang's factory exhaust manifold, and
Ricardo got both headers in and secured by the bottom fasteners. Then he and Eddie combine
Header installation is relatively painless, provided the Mustang and its engine are raised
The stock, wideband oxygen sensors must be transferred from the factory manifolds to each
While fitment really is great, we did experience one small clearance issue (steering linka
The 3-inch theme continues from the H-pipe to the back of the 'Stang. The Street Series Ca
The after-cat's over-the-axle tubes requires installing two spacers between the Panhard-ba
Included with the kit, the shims create clearance for the big mandrel-bent tube to pass ov
Ricardo positions the mufflers on their hangers. MBRP's cans fit in the OEM location witho
Ricardo fits the 4-inch tip on the tail of the MBRP exhaust system we've installed on Kurt
We definitely like the look and fit of the MBRP '11 5.0 Mustang header system, and the sou
Here is the completed installation. Here is the completed installation.
On The Dyno
By telephone and e-mail, Ricardo communicates engine data to Chris after each dyno pull.
Thanks to a previously installed JLT cold-air system, Kurt Schutt's '11 Mustang GT stomped down an impressive 395 horses at the feet during the baseline-dyno portion of our exercise. That's par for the course among Coyote 'Stangs that have this mod.
With the 400-horse plateau in sight and MBRP's long-tube headers and complete exhaust system installed on the GT, the car was once again loaded on the Dynojet chassis dyno at GTR High Performance, so we could determine how much power and torque a freer exhaust will manifest.
As you see in the data from the "after" run, horsepower and torque show nice increases, as power is solidly into the 400s and the long-tubes yielded enough additional grunt to definitely get your attention. (Before you California readers get excited, none of the pieces we installed are CARB-approved/California-legal.)
A wide-open exhaust passage, using MBRP's non-catalytic H-pipe (PN S7236409; $418.95) and Race Series cat back set (PN S7226409; $901.95) should offer an estimated 20 more horsepower and 25-plus lb-ft of torque beyond the numbers we achieved with Kurt's naturally aspirated, CAI-only 'Stang.
Chris then analyzes the stats and makes changes to the calibration based on that data (pri
The post-install segment of our dyno test was highlighted by our first venture into the wo