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409 SS or 304 SS

Discussion in 'Performance and Tuning' started by TruckyTruck, Oct 27, 2015.

  1. Oct 27, 2015 at 5:17 PM
    #1
    TruckyTruck

    TruckyTruck [OP] New Member

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    Guys, I plan on buying headers and mid pipes soon. I will be purchasing a set of 304 SS JBA headers no matter what type of stainless runs after them. My cat back, built by Kieth from DirtyDeeds, is made of 409 and if memory serves, the TRD tailpipes are 304, although they are ceramic coated satin black.

    My question, or rather your opinion that I'm after is about what makes sense for the mid pipes. I have a set of fairly new stock 409 cats and I'm wondering if it makes sense to install them into 304 SS JBA mid pipes.

    It's about an 80 dollar difference and I'll do the tig work myself. If I just did them in 409 and high temp black, how long would they last?

    I pretty much analyze every which way before I spend my hard earned pennies, so just humor me. :goingcrazy:
     
  2. Oct 27, 2015 at 5:46 PM
    #2
    Virgils12

    Virgils12 New Member

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    Sorry if my question is dumb but what are you calling the mid pipes?
     
  3. Oct 27, 2015 at 6:47 PM
    #3
    TruckyTruck

    TruckyTruck [OP] New Member

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    The pipes between the manifold and mufflers. They hold the catalytic converters.
     
  4. Oct 27, 2015 at 10:57 PM
    #4
    csuviper

    csuviper Moderator Staff Member

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    Some Mods :) See build thread for details
    316L instead. :D
     
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  5. Oct 27, 2015 at 11:03 PM
    #5
    csuviper

    csuviper Moderator Staff Member

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    Some Mods :) See build thread for details
    304 has a chromium content between 18% to 20% and a nickel content between 8% to 10%.
    409 has chromium content of 10.50% to 11.75% and a nickel content of only 0.50%.
     
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  6. Oct 28, 2015 at 5:50 AM
    #6
    chphilo

    chphilo New Member

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    Toyota stock pipes are, I believe, 409. When I changed them out with the TRD exhaust, I noticed the pipes were covered with rust after only two years.

    I would say get 304 if your weather has any moisture content that will likely to make things rust. It's worth the extra money. I guess if you live in Arizona, it doesn't matter.

    Apparently it's not just wintery regions that has rust problems. Summer time can apparently become a major source of headache as well.
     
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  7. Oct 28, 2015 at 6:50 AM
    #7
    csuviper

    csuviper Moderator Staff Member

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    304 is my choice
     
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  8. Nov 4, 2015 at 9:03 AM
    #8
    TruckLife900

    TruckLife900 All Eyez On Me

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    Ditto
     
  9. Nov 4, 2015 at 6:28 PM
    #9
    matluth

    matluth Fish On!

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    18"X9" FN BFD's rims, 295/70R/18E Cooper Discoverer STT Pro's, upgraded to Old Man EMU coil-overs/shocks. Toytec shackles Next: true dual exhaust, new UCA's.
    Ditto X2. By the way, not just "wintery' conditions. If you live near any coast, east,west, Gulf, you will see a lot of vehicles with rust issues. (Salt in the air, worse than winter road salt. Coastal salty air is year round, 24/7)
     
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