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Alright...I know this is a topic that is beat to death...cracked V8 manifolds

Discussion in '4th Gen 4Runners (2003-2009)' started by clarkremark, Jul 16, 2019.

  1. Jul 16, 2019 at 10:10 PM
    #1
    clarkremark

    clarkremark [OP] New Member

    Joined:
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    Matt
    Vehicle:
    2008 4Runner Sport V8
    Black Rhino Wheels, K&N Cold Air Intake, Roof Basket
    Hey gang,

    I have a 2008 Sport V8 and can't stand the exhaust leak. So much so that I've been seriously considering selling my 2008 and just buying a 2014-2017 Trail Premium....but I love this V8 and I can make this truck really nice for $3-5k instead of signing on the line that is dotted for $30k+

    I know this one has been beat to death, and it seems like everyone recommends the Doug Thorley manifolds to replace the stock ones. Here's the rub, I only have a leak on one side, so paying a shop to do both sides could cost a small fortune...or the same amount as one side at the dealership.

    My biggest question is this...can I do it myself? I'm relatively handy and can usually find my way around just about anything, but this particular job scares me. What if I snap off a stud? What if I can't get the Thorley's to fit? What if, what if, what if??

    Has anyone done this in their garage? Is it worth renting an engine hoist and figuring out how to yank the engine to just do both sides? Has anyone done it that way???

    Too many questions, I apologize. Just looking for some advice or even a "dude, you're crazy to try it on your own", which is what the mechanics I speak to say...some won't even take the job.

    Thanks in advance!
     
  2. Jul 17, 2019 at 9:14 AM
    #2
    MattAK

    MattAK Headin' for the hills

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    Utah
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    '08 Sport V8 Galactic Gray
    Fixed broken shiz. Dobinson's 3"
    Fortunately my V8 doesn't have the leak (yet) but my dad's does so I looked into this a bit recently. My decision was if it came down to it I was going to have a shop do it because doing it myself in the driveway looks like a huge PITA that I just don't want to deal with. You can do it without removing the engine but it's a long tough job and since my 4Runner is my daily I'd be down my primary transportation until I got it done. I also live in a place that does emissions testing so I'd have to get cats welded onto the headers anyway which I definitely don't want to attempt myself.
     
  3. Jul 17, 2019 at 4:28 PM
    #3
    clarkremark

    clarkremark [OP] New Member

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    Matt
    Vehicle:
    2008 4Runner Sport V8
    Black Rhino Wheels, K&N Cold Air Intake, Roof Basket
    Thanks!
     
  4. Jul 23, 2019 at 12:21 AM
    #4
    Ink09

    Ink09 New Member

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    2007 4Runner Limited V8
    I have also just recently gotten the dreaded exhaust leak and have been trying to figure out the best course of action to take, luckily I don't have to deal with emissions though..
     
  5. Dec 23, 2020 at 12:03 PM
    #5
    iamincrediboy

    iamincrediboy New Member

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    MD
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    Resurrecting an old thread here but just in case someone else comes along...

    Don't bother with a new OEM manifold cause they're what's cracked in the first place. In the end, Doug Thorley headers are best hands down, despite the price (if you don't have to worry about emissions get long tube, if you do get short tube and then Magnaflow universal fit cats if you cant reuse your old), Doug Thorley or URD y-pipe, then your choice of cat-back: Magnaflow, Flowmaster, URD, TRD, BAM, Borla, and others, to your liking. I posted elsewhere too but if you do wind up changing your cats at all from stock - either deleting or getting high-flow - you have to do something to your downstream O2 sensors or your CEL will come on; DO NOT touch your upstream sensors. Sometimes a simple spacer or two will fix it, otherwise (what I had to do) is get essentially a 'mini-cat'. This little thing will trick the ECU into thinking the airflow is what is supposed to be coming out of the cat instead of what we want for more power/sound; here's the one I bought exactly: https://www.ebay.com/itm/90-Oxygen-...tor-Mini-Cat-Catalytic-Converter/313200386411
     
  6. Dec 23, 2020 at 4:41 PM
    #6
    ElShep

    ElShep New Member

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    go with DT headers, if your gonna have everything taken apart, replace it with the headers.

    could it be done yourelf? depends how many times you wanna curse and bust your knuckles. i had it done at a $hop i usually go to, the nicest old mechanic there said that he has never cursed so many times at a customers truck in his life as when he did my headers. food for thought. according to him there were multiple broken studs removing the manifolds, and having to fit the headers in between the frame rails was a PITA accourding to him.

    i was going to attempt it myself originally, but my schedule with work just would not allow it to happen. but after hearing his ordeal, im glad that i didnt take it on.
     

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