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Exhaust flange

Discussion in '308/328' started by TommyA, Sep 2, 2021.

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  1. TommyA

    TommyA Formula Junior

    Oct 7, 2002
    549
    Atlanta
    Full Name:
    Tommy A
    #1 TommyA, Sep 2, 2021
    I'm trying to build my test pipes to replace the cats and I'm having a hard time sourcing the exhaust flanges that are on on the ends of the cats. Any suggestions will be greatly appreciated.
     
  2. kcabpilot

    kcabpilot Formula 3

    Apr 17, 2014
    1,608
    California SF bay area
    Full Name:
    Paul
    #2 kcabpilot, Sep 2, 2021
    Pretty sure I got mine from Summit. I don't recall having any trouble finding them. The only thing was that they were flat so I had to grind chamfers on one side for the donut seals. I'll see if I can dig up the receipt.
     
  3. TommyA

    TommyA Formula Junior

    Oct 7, 2002
    549
    Atlanta
    Full Name:
    Tommy A
    #3 TommyA, Sep 2, 2021
    Thank you. The only thing that I was able to locate are some SS from Mandrel Bends at $24 each and a hefty shipping cost :(
     
  4. kcabpilot

    kcabpilot Formula 3

    Apr 17, 2014
    1,608
    California SF bay area
    Full Name:
    Paul
    #4 kcabpilot, Sep 2, 2021
    Okay, found my invoice.
    Summit Racing Equipment P/N APH-9152S Flange $5.99 ea Shipping was $7.99 Total $31.95 That was Dec 2018
    I got the pipe on Amazon from Patriot Exhaust P/N PEPH7756 2"x 5 feet 18 Gauge Steel (not stainless) $38.20
    My car is an '83 so dual 2 inch Cats
    Here is picture of jig I made.

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    308 milano likes this.
  5. TommyA

    TommyA Formula Junior

    Oct 7, 2002
    549
    Atlanta
    Full Name:
    Tommy A
    #5 TommyA, Sep 2, 2021
    You did a really nice job with it. Unfortunately my car is an 82 and has the 1.75" pipes.
     
  6. kcabpilot

    kcabpilot Formula 3

    Apr 17, 2014
    1,608
    California SF bay area
    Full Name:
    Paul
    #6 kcabpilot, Sep 2, 2021
    Oops sorry my mistake, I went out and measured one of the old Cats and mine is 1 3/4 inch OD just like yours. I think the single pipe '84/85 is 2 inch.
     
  7. TommyA

    TommyA Formula Junior

    Oct 7, 2002
    549
    Atlanta
    Full Name:
    Tommy A
    #7 TommyA, Sep 3, 2021
    Paul, now I'm lost!! The parts number for the flange is good but it's a 2". How did you manage?
     
  8. kcabpilot

    kcabpilot Formula 3

    Apr 17, 2014
    1,608
    California SF bay area
    Full Name:
    Paul
    #8 kcabpilot, Sep 3, 2021
    Last edited: Sep 3, 2021
    Look closely at the picture you'll see the mount holes are elongated so they will fit a range. Also the donut seals have enough play to fit over the 2 inch pipe, they don't seal on the pipe, they seal on the flange chamfer. It's been working for me for a couple of years now, no issues. Those are spring loaded joints, no need for absolute precision so long as you get a seal. It's only 1/8th inch each side (1/4 total)

    Also, if you calculate the circular area the '84/'85 QV's need a 2.5 inch pipe to have same throughput as the dual 1.75 inch pipes..
     
  9. TommyA

    TommyA Formula Junior

    Oct 7, 2002
    549
    Atlanta
    Full Name:
    Tommy A
    #9 TommyA, Sep 3, 2021
    Thank you.. I will give it a go ;)
     

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