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Mid Length Headers

This is a discussion on Mid Length Headers within the External Engine forums, part of the LSx Technical Help Section category; Ok I'm really stuck here. I need to know if anybody uses Mid Length Headers on there Stock LS1? If ...

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    One is Puter One is Gray
    2000 Z28, 1994 Z28

    Mid Length Headers

    Ok I'm really stuck here. I need to know if anybody uses Mid Length Headers on there Stock LS1? If so what kind do you use, hp gains and do you maybe have any dyno print-outs to let me see the gains? Please help, any and all information will be greatly appreciated. Thank You Jamie55
    You can either PM me or email me.

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    One is Puter One is Gray
    2000 Z28, 1994 Z28

    Mid Length Headers

    Oh yeah I forgot I have an auto transmission and the reason for the Mid Length Headers is for emission legal.

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    One is Puter One is Gray
    2000 Z28, 1994 Z28

    Crap I forgot it is also a 2000 Camaro Z28, hey I'll get it togeather sooner or later

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    Just me Y2KPewterSS's Avatar
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    Pewter metallic
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    Mac midlengths put down very good #s on a stock LS1, bout the same that long tubes would. The big advantage to long tubes is if you ever cam the motor, then the long tubes would be more beneficial than the midlengths.
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    Pathelogical Liar BlackLT1Z28's Avatar
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    Not sure on an LS1, but would mids keep it emissions legal? I thought only shorties would, visually anyways. Exhaust wise, longtubes can pass emissions, but from what I'm told, only shorties will pass visually.

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    member since may 2000 nhraformula's Avatar
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    anything other than a shorty header will move the cats back making it a so called no no.
    that being said, mac mids are really good headers.
    i have long tubes and just passed emissions this past saturday
    2000 nhra edition formula
    a few bolt ons, 379 rwhp
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  7. #7
    member since may 2000 nhraformula's Avatar
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    get a stall conveter before headers. for an automatic car, a stall provides the best performance gains out there

  8. #8
    Senior Member INMY01TA's Avatar
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    Mac mids are no more emissions leagal than long tubes. I had em for years, good headers. Got long tubes now, even better.

  9. #9
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    One is Puter One is Gray
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    Hm it says that Gobson Mid Lengths are emission legal in 49 States. Any truth to that. I am going to up grade to Super Charging so just go with LT's. We don't have look at inspections here in WA just the sniffer. Thanks Jamie

  10. #10
    Member 89LX's Avatar
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    2000 Z28 M6

    Check Out This Thread

    Check out this thread and there is a lot of good scoop "Dif Between Mid-Tube and Shorty".
    2000 Z28 M6, SLP Lid, SLP Bellows, SLP UD,
    P&P Maf, TB By-Pass, PS Shorties, LS6 Intake, FAST 78mm TB, Hooker CB, Hurst Billet, Front Tower Brace, small 218/218....527/527....114 cam.
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  11. #11
    Senior Member INMY01TA's Avatar
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    Long tubes and midlenghts are illegal in all 50 states.

  12. #12
    Member Frosty's Avatar
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    I don't think anyone picked up on this.

    If WA doesn't do a "visual" inspection who cares. Since your car is OBD-II they shouldn't even do the "sniffer" test. All they'll probably do is plug in their scanner and make sure there are no codes.
    -98 GTP Coupe. Silvermist and stock.

    -89 GTA*** L98, P1-SC, 24# SVO's, MSD 6-A, March underdrive pulleys, Edelbrock headers/catback and some other goodies.

    ~Tony

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