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BladeRunner Ported Ductile Iron Exhaust Manifolds

Jeep Wrangler (JK) 07-11 V6-3.8L
Part Number: 46-40114

MSRP: $329.27


  • Outflows the factory manifold by 12%, improving performance and throttle response
  • Compatible with factory y-pipe for easy installation
  • Performance cast manifold with header-style flow path
  • Durable ductile iron construction outlasts factory manifold
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Bolt on instant performance by upgrading your restrictive factory manifold with this BladeRunner ported manifold. Designed to outflow the stock manifold by 12% for improved throttle response, this BladeRunner manifold has both the inlet and the outlet ports machined for a smooth transition and optimal flow path. Constructed from heavy walled, ductile iron to resist warping and cracking, this BladeRunner will outlast OE and factory replacement manifolds.

Performance Gains:
Outflows factory manifold by up to 12%.

Machined Ports:
These manifolds have both the inlet and the outlet ports machined for a smooth transition and optimal flow path for improved throttle response.

Durable Ductile Iron:
Heavy walled ductile iron material resists warping and cracking without compromising the integrity of gasket sealing.

Hassle-Free Installation:
This manifold bolts directly to the factory y-pipe for easy installation.

Emissions Disclaimer:
This product is not currently CARB exampt and is not available for purchase in California or for use in any vehicle registered with the California Department of Motor Vehicles.

All aFe exhaust systems are engineered and manufactured in our Corona, California facility.


Vehicle Applications

Year Make Model SubModel Engine Fuel
2007-2011Jeep Wrangler JK V6 3.8L Gas
Reviews (1)

Customer Reviews (1)

Overall average

Average Ratings By Category:

  • Quality
  • Value
  • Easy Install

1 Item(s)

Highly recommend for upgrade on all JKs with a 3.8L
I bought the AFE BladeRunner Ported Ductile Iron Exhaust Manifolds for my son’s 2007 JK to replace the factory pieces that had the common cracks on both sides. I researched for months trying to decide between a stainless-steel set or something close to OE. Came across these and decided to give them a try, as the stainless-steel units have issues of their own with giving off excess heat and melting wires. Jeep is a daily driver and occasionally takes some trails and two tracks off in the mountains.
These AFE manifolds seem to be well built and are a lot thicker and heavier than the OE. The openings are ported which will allow better air flow. Both sides aligned well with the factory Y-pipe. My only 2 issues (not really a complaint), were;

1. The bolt holes on the AFE manifolds are larger than the OE manifolds making proper alignment a bit of a pain. They went on easily and hopefully lined up correctly on the heads not obstructing the openings. Factory bolts are a M8x1.50 and the holes on the AFE are a bit larger creating some play when trying to install and align.

2. The way the manifolds are designed and cut makes accessing two of the bolts on the driver’s side a little tricky. The cut leading to the bolt creates an angle and I could not get a good bite on these two bolts to get a proper torque. I tried many different socket lengths, universal joints, and extensions but could not get the socket to fit flush on the bolt head due to the angle and limited space provided. I did not want to strip the bolt head and had to tighten the one rear bolt by feel using a combination wrench. With a little finagling, I was able to get these installed without any other issues.

I am very pleased with these manifolds thus far. The ductile iron is supposed to be stronger and handle the heat generated by the 3.8L without warping or cracking. The Jeep runs like a different vehicle and there is a significant improvement in the throttle response. No more annoying ticking from the cracks when first cranking the engine. I have only had these on for two weeks and no complaints. I did install high temp boot protectors on a new set of wires and a new high flow muffler. Even with the OE manifolds the wires had some hot spots on them. The wires taken off were new and replaced last year. I will update in 6 months or so and see how these manifolds are holding up in relation to cracks and performance. Also, the MPG show an improvement of 2 MPG since the install.
  • Quality
  • Value
  • Easy Install
Review by Wes / Posted on 6/12/2019

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