Lethal Performance 2011-2014 Mustang 3.7L V6 2.5" Offroad H-Pipe

SKU: LP-611204-A

Manufacturer: Lethal Performance

229.99 $

Availability: In stock

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Lethal Performance 2011-2014 Mustang 3.7L V6 2.5" Offroad H-Pipe

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Lethal Performance 3.7L V6 2.5" Offroad H-Pipe

-Direct Replacement for your stock X-pipe
- 14 to 16rwhp Increase
-Mandrel Bent 2.5" Aluminized Steel
-Includes Hardware for installation
-Fits Auto and Manual Cars
-Removes Stock Cats
-Tune Required

We finally found the time to mock up an offroad x and h pipe for the 2011 3.7L V6. We've seen how well they work on all of the previous model mustangs so why wouldn't it work on the 2011 v6?

When I first started talking about this on some of the forums several members questioned it. However I said to myself this is a 305hp car. Removing the cats has to show some gains.

So we headed off to Power by the Hour in Boynton Beach, FL where Jake and crew helped with our testing. The test car was a 2011 V6 with the automatic transmission and 93 octane. Our first 2 baseline runs yielded us only 224rwhp and 245rwtq. Definitely lower HP than I thought it would make but the TQ looked good. Keep in mind that the auto trans typically makes less then a manual car does. That's just part of the drivetrain loss associated with the auto trans.

After the baseline runs were done we let the car cool down and did the swap over to our 2.5" offroad X-pipe. Just like the stock midpipe our offroad midpipe is 2.5" all the way back and necks down to 2 1/4" where it mates to the stock overaxle pipes.

We put the car back on the dyno and ran it again with the stock calibration. Both runs showed an increase of 14 and 16rwhp. Torque increased by 5rwtq on each run.

We then flashed the car with an SCT X3 loaded with a custom tune from our tuner Jon Lund. Ran the car again 2 times and the car picked up another 5-6 rwhp making the total gain for the offroad x-pipe and tune around 20rwhp.

Then it was time to ditch the closed stock airbox for one of JLT's cold air kits. The installation of the intake was a breeze. JLT's air kit goes together in minutes and fits perfect. It had all of the connections needed for the PCV and came with high quality silicone hose couplers. Swap the stock maf sensor over and bolt the heat shield in and you're done.

JLT's intake doesn't require a tune however Jon Lund put together a tune he believed would work best for the intake and offroad pipe.

We made a few more pulls and were pleased to see a 28-30rwhp increase over stock.

Not bad for a few hundred dollars worth of mods. Not only did we pick up some respectable rwhp and tq the car sounded much more aggressive with the catless pipe.

Make sure to check out our Facebook page www.facebook.com/teamlethal and "LIKE" us to see more info and dyno sheets of our testing.


Manufacturer Lethal Performance
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Customer Reviews

Self install and with Borla ATAK Review by Mario
So I installed this midpipe and it took 2 days to do!!! Supposed to take 2 hours but due to some missing tools and runs to home depot, and also a stripped nut that was giving me issues! It sounds amazing. Be warned, if you have a loud axel back like i do (Borla ATAKs) it will amplify your car by almost double.
Please please please make sure you get a foot long extension to reach the super stubborn nuts under the manifold. Youl need it for sure. Overall it was a great buy with great sound and performance (Posted on 11/8/15)
really opens up the flow! Review by Chris
install was quick and easy, took about an hour on the lift, everything fit great. tremendous increase in flow was immediately noticeable. be aware, this is going to dramatically increase your exhaust volume if you already have a free flowing mufflers.

Install was done a 2011, procharged 3.7, with GT500 take off mufflers from the axle back.

I added a pair of resonators to "calm it down". after installing the resonators, the tone is even deeper, and much smoother, with no rasp or tinny sounds , way better sounding than it was before removing the cats. very muscular. and when you put your foot into it, it doesn't disappoint. it downright howls once you get into the revs.
the best part- the wife doesn't think it sounds like rice anymore.

great product if you want to improve flow and decrease resistance in your exhaust system.

(Posted on 5/6/15)

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