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Thread: under car exhaust has anyone done this ?

  1. #1
    Junior Member
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    under car exhaust has anyone done this ?

    Has anyone done under car exhaust on there F I A

    Thanks

  2. #2
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    You might want to contact 65 Cobra Dude, he did an excellent under car exhaust on a roadster recently.

  3. #3
    Senior Member EZ$'s Avatar
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    2Fast4U did it on his 289FIA. Check out his build thread.
    Rick

    Mk4 with Mr. Bruce FIA body, 331 w/ Speedmaster Stack Injection, Full Width Roll Bar with high brake lights by i.e.427, IRS, ABS, PS, PB, FAST FI, First start 3/30/20, First go-kart 7/5/20, paint by Ken Pike

  4. #4
    Senior Member cnutting's Avatar
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    Eddie (vspeeds) did one too. Came out real nice.
    FFR #8833 289 FIA 3-link
    1965 289, TKO600 from Forte's Parts Connection
    Body and Paint by Mike's Auto Restoration
    Picked up 3/5/2016, First start 4/22/2017, MA legal 7/11/2018
    Build Thread http://thefactoryfiveforum.com/showt...FIA-build-8833
    "Insanity is contagious" - Joseph Heller

  5. #5
    Member Zots's Avatar
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    You can check out my 289 build thread.
    under_car1.png under_car_header.png under_car_system.png

  6. #6

    Steve >> aka: GoDadGo
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    Quote Originally Posted by Zots View Post
    Zots,

    Were those Spintech Low Profile Mufflers that you used?

    https://spintechmufflers.com/3000xlf...ofile-muffler/

    Steve

  7. #7
    Member Zots's Avatar
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    Quote Originally Posted by GoDadGo View Post
    Zots,

    Were those Spintech Low Profile Mufflers that you used?

    https://spintechmufflers.com/3000xlf...ofile-muffler/

    Steve
    SpinTech Cruiser 7000 Oval outlet Muffler: The CRUISER muffler measures 2 1/4" thick, that is the flattest Performance muffler available! I used the 2.5" oval side exit. It tucks up nicely under the MK4 raised seat area.
    https://spintechmufflers.com/street-...r-low-profile/

  8. #8
    Senior Member 2FAST4U's Avatar
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    I did it on my build. I’ll post some pics

    I had a custom exhaust shop make custom headers from 1-5/8 mild steel and use a V-band clamp to attach the pipes to. They were later ceramic coated black







    Last edited by 2FAST4U; 02-08-2020 at 04:09 PM.

  9. #9
    Senior Member 2FAST4U's Avatar
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    The pipes run under the car under the seats. The mufflers are under the seats











    I added 90 degree turns that exit in front of the rear tires. Tubing is 2-1/2” mild steel, now painted black to the mufflers, and aluminum colore from the muffler outlet to the exhaust outlet. I had to make custom hangers
    Last edited by 2FAST4U; 02-08-2020 at 04:13 PM.

  10. #10
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    Thank you for all the info Sorry its been awhile . Still deciding if I want to build again its been 20 years since the my first one . Has anyone found or made the flat exhaust pipe like you see on nascar just a though

    Thanks again Pete

  11. #11
    CobraboyDR's Avatar
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    I am also interested in undercar exhaust, but with a rear exit. I'm pondering a AC 289 Sports Mk.III replica, pure street car, small block, undercar exhaust, no scoop or roll bar and wire wheels.

    The challenge I see is exhaust system ground clearance under the main frame cross members of a FFR. A system under these members gets really close to the ground. The rest, around the rear suspension, I believe can be worked out without a lot of stress.

    I'm also looking at C3 Corvettes (not either/or, but both; I like C3's.) The C3 makes a nice platform for inexpensive performance upgrades in a cruiser. In a C3 Corvette, the main cross members have two 3" tubes firmly welded in them, and the exhaust pipes go through these holes. I have not ever heard of a frame failure from these welded tubes. They also have engine-hugger headers.

    I can understand the angst some might experience in drilling big holes in cross members, but would not this be a more elegant solution? Then run pipes through these holes? And would proper cutting, insertion of a 3" pipe through the member, and good welding not weaken the frame? I mean, the car is light so the stresses are minimal.

    And with the absence of side pipes and the gap in front of the footboxes to route them, would this also allow footbox modifications that could allow size 12+'s on a larger human with comfort? Imagine another 1-2" of room to the pedals!

    Am I missing something?

    What say you?

    (Edit) This is an AC 289 Sports Mk.III:



    (Yeah, I know, that's a "narrow hip" car. True enough. I guess you can't have everything, and a narrow hip conversion is waaaay too much work, and only a mega classic Cobra geek like yours truly would know the difference...)
    Last edited by CobraboyDR; 11-06-2020 at 06:36 PM.

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