Magnaflow Cat-back Exhaust Install 5th Gen 4Runner

 In 5th Gen 4Runner Mods, Aftermarket Install, T4R Accessories, Trail T4R

Magnaflow Cat-back Exhaust Install 5th Gen 4Runner

Instructions and Step by Step Install Guide for the 5th Gen 4Runner MagnaFlow Exhaust System. 

5th Gen 4Runner MagnaFlow Exhaust

5th Gen 4Runner Magnaflow Exhaust

MagnaFlow 15145 MF Series Performance Cat-Back Exhaust System

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Step by Step Installation and Instructions of the MagnaFlow 15145 Cat-Back Exhaust System. This install is on a 2014 Trail 4Runner; however, this MagnaFlow exhaust (15145) will fit on other Toyota 4Runner models (2012-2014). This is a very simple aftermarket 4runner exhaust system install and can take under 3 hours given you have two guys to uninstall the OEM exhaust and install the new MagnaFlow 15145 Cat-Back Exhaust System.

You will get the most out of this exhaust system if you couple it with an aftermarket 4Runner CAI (Cold Air Intake) system; however, this is not needed. The CAI combined with an aftermarket exhaust will completely open up the airflow through your engine, thus increasing the overall performance of your 4Runner. Also, having an aftermarket CAI will increase the life of your aftermarket 4Runner filters. For more information on aftermarket 5th Gen 4Runner parts and accessories, browse through our site and please let us know if you have any questions.

MagnaFlow 15145 MF Cat-Back Exhaust Specs

  • SYSTEM TYPE: CAT-BACK
  • SERIES: MF
  • EXIT: STYLED
  • OUTLET QTY: SINGLE
  • TUBING: DIA2.5 IN
  • TIP FINISH: POLISHED
  • MATERIAL: STAINLESS STEEL

Uninstall and Installation Time

  • 2.5 – 3 Hours

Tools Needed for the Install

Step 1: MagnaFlow Cat-Back Exhaust Install – Jack up Truck

It would be nice to have a lift but you do not need one to install the MagnaFlow Cat-Back Exhaust. If you jack up your 4Runner a couple of feet, you should have plenty of room to move around underneath. Always remember to be safe while you are operating and working underneath your 4Runner. You will want some car creepers or something to move around on once you are underneath the truck. This makes for an easy process for getting in and out from underneath your 4Runner.

MagnaFlow Exhaust Cat-Back Exhaust Install - Jack up Truck

Step 2 – MagnaFlow Cat-Back Exhaust Install – Unbolt Exhaust from Y-pipe

Start by unbolting the OEM 4Runner exhaust from the Y-pipe under the center of the truck. This is the piece that connects the actual muffler to the Y-pipe. At this point, you do not want to actually remove the exhaust or even the bolts. Leave the bolts connected. Right now we are just loosening the connection from the exhaust to the Y-Pipe. We don’t want to remove the bolts because we will need to remove two more bolts that are connected to the exit tubing.

In V6 and V8 engines where there is more than one exhaust bank, ‘Y-pipes’ and ‘X-pipes’ work on the same principle of using the low pressure component of an exhaust pulse to increase the velocity of the next exhaust pulse

MagnaFlow Exhaust Cat-Back Exhaust Install - Unbolt Exhaust from Ypipe

Step 3 – MagnaFlow Cat-Back Exhaust Install – Unbolt Exhaust from Exit Tubing

We will need to remove two more bolts that are connected to the exit tubing. At this point, you want to loosen these bolts as well. It is important to keep the bolts on that are connected to the Y-Pipe as the whole system moves when you are trying to unbolt the exhaust from the exit pipe.

You remove the bolts from the Y-Pipe (like we did), you are going to have a hard time getting leverage on unbolting the exhaust from the exit pipe. We had to put the bolts back on to get enough leverage to remove the second set of bolts pictured below.

After you have loosened the 4 bolts from the Y-Pipe and the exit pipe, you can now remove all 4 bolts and set the aside.

Save the bolts from the Y-Pipe section, you will need these to install the new MagnaFlow Cat-Back Exhaust on your 4Runner.

MagnaFlow Cat-Back Exhaust Install - Unbolt Exhaust from Exit Tubing

Step 4 – MagnaFlow Cat-Back Exhaust Install – Use WD40 to loosen up the Rubber Connectors (Rubber Isolators)

Next, you want to remove all 5 of the rubber connectors (rubber isolators) that hold your exhaust on and prevent your whole truck from shaking when your engine is running. Pictured below are all 5 rubber connection points.

VERY IMPORTANT: Do not damage the rubber connectors, you will need these to install the new MagnaFlow Cat-Back Exhaust on your 4Runner.

To loosen the rubber connectors, use WD40 and a very small flathead screwdriver. Use the flathead screwdriver to open up the rubber connectors in between the rubber and metal. Spray the WD40 in between these small spaces and slide the rubber connectors back and forth until everything is sliding around nice and free.

VERY IMPORTANT: Do not remove any rubber connectors at this point. These are the only thing that is holding your 4Runner OEM exhaust on.

5th Gen 4Runner Exhaust Install - WD40 on Rubber Connectors

Rubber Connector 1

5th Gen 4Runner Exhaust Install - Rubber Connector 1

Rubber Connector 2

5th Gen 4Runner Exhaust Install - Rubber Connector 2

Rubber Connector 3

5th Gen 4Runner Exhaust Install - Rubber Connector 3

Rubber Connector 4

5th Gen 4Runner Exhaust Install - Rubber Connector 4

Rubber Connector 5

5th Gen 4Runner Exhaust Install - Rubber Connector 5

Step 5 – MagnaFlow Cat-Back Exhaust Install – Remove OEM 4Runner Exhaust

After you have greased up the rubber connectors with WD40, you can now remove all rubber connectors and remove the OEM 4Runner exhaust.

MagnaFlow Cat-Back Exhaust Install - Remove OEM 4Runner Exhaust

Step 6 – MagnaFlow Cat-Back Exhaust Install – Remove OEM 4Runner Exhaust Pipe

After you have removed the OEM 4Runner exhaust, you can now remove the actual exhaust pipe from the back of the 4Runner.

VERY IMPORTANT: Note that you will have to lower the replacement tire in the rear of the 4Runner to allow the old OEM exhaust pipe to exit and be removed. If you do not lower the tire, you will not be able to remove the exhaust pipe (yes, this happened to us as well). Hopefully, this helps you expedite the process a little faster.

MagnaFlow Cat-Back Exhaust Install - Remove OEM 4Runner Exhaust Pipe

Step 7 – MagnaFlow Cat-Back Exhaust Install – Ready for Install

Note that the old OEM exhaust is two pieces and the new MagaFlow exhaust is 4 pieces. The new MagnaFlow Cat-Back Exhaust comes with the exhaust, tailpipe, two sections of tubing and three clamps to clamp down the tubing sections.

MagnaFlow Cat-Back Exhaust Toyota 4Runner (5th Gen)

MagnaFlow Cat-Back Exhaust Install - Ready for Install

Step 8 – MagnaFlow Cat-Back Exhaust Install on your Toyota 4Runner (5th Gen)

The first section of the new exhaust you want to install is this crooked looking piece of exhaust tubing. This will go straight up and over the frame of your 4Runner. Just let it sit there where you grab the new MagnaFlow exhaust system.

MagnaFlow Cat-Back Exhaust Install Toyota 4Runner (5th Gen)

Step 9 – MagnaFlow Cat-Back Exhaust 4Runner Install – Installing New Exhaust

Grab the new MagnaFlow Exhaust and start connecting the exhaust back onto the truck with the rubber connectors that you left in pristine condition. Once you have the exhaust back onto the rubber connectors, you can grab the two bolts that you disconnected from the Y-Pipe and bolt those back onto the new system.

MagnaFlow Exhaust Cat-Back Exhaust Install - Installing New Exhaust

Step 10 – MagnaFlow Cat-Back Exhaust 4Runner Install – Installing New Tail Pipe (New Clamps)

Once you have the new MagnaFlow 4Runner exhaust bolted onto the Y-pipe and connected to all the rubber connectors, you can now start to clamp on the remaining two clamps in the rear and exit of the exhaust system.

MagnaFlow Exhaust Cat-Back Exhaust Install - Installing New Tail PipeMagnaFlow Exhaust Cat-Back Exhaust Install - Bolting on New Clamps

That’s it! This is a very easy install if you have a couple spare hours in your day. It took us around 3 hours from opening the doors to having the new exhaust on the 4Runner. It was an awesome and easy little mod job for your 4Runner or Tacoma. Up next is the TRD CAI (Cold Air Intake). We will see what happens…

You want to check out the exhaust in a couple days and make sure all of the rubber connectors are still in place. It would be a bummer if one of those fell off, you would have a bad time.

5th Gen 4Runner Magnaflow Exhaust

Please comment below and let us know if you have any questions!! Thanks, good luck!

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Showing 4 comments
  • Stephen
    Reply

    What benefits do you get with this mod? More HP? Better MPG?

    • Bgreene
      Reply

      Stephen,

      Obviously better sound, the tip looks bad ass. From an actual HP perspective, I have not run any tests but I honestly do feel the difference when I get on it. We did not put in on a Dyno, so hard to really tell.

      Yeah, the exhaust is much larger so I definitely get better exhaust flow. Everything back from the Cat is going to be easier on the engine.

      In terms of MPG, I don’t know what to say… it’s a 4Runner. I have not noticed a huge difference.

      I can say with the sound being better, I do get on the gas a lot more often and do not regret installing the exhaust overall.

  • JimmyJet
    Reply

    Why did you choose to go with a Magnaflow over other brands?

    • Bgreene
      Reply

      James,

      After reading for hours and probably months in the forums, it came down to the sound. As most Catback exhaust systems; Flowmaster, Cherrybomb, Borla, and Magnaflow are similar in performance, the sound of each are very different.

      I thought the Flowmaster and Cherrybomb exhaust system would have been too loud for my taste.

      Also, I thought the Borla Catback exhaust system would have been a little underwhelming for my taste.

      Quality and performance on all of them are good. The Borla system is barely louder then stock, Flowmaster sounded way too deep for me. Magnaflow was my Goldilocks of Catback exhaust systems… just right.

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