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Tightest driver's side Cali-legal header

This is a discussion on Tightest driver's side Cali-legal header within the External Engine forums, part of the LSx Technical Help Section category; OK, this is a weird one: there are some guys on Miata.net trying to get LS1 Miatas legal in Kalifornia. ...

  1. #1
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    Tightest driver's side Cali-legal header

    OK, this is a weird one: there are some guys on Miata.net trying to get LS1 Miatas legal in Kalifornia. The conversion requires a VERY tight-fitting header on the left side (steering shaft). So: does anyone know the tightest-fitting header that has a CARB certification? Many LS1 Miata guys will thank whoever comes up with one!

    (Which isn't really worth much besides karma...)

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    Just me Y2KPewterSS's Avatar
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    Mac mids maybe?

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    Senior Member INMY01TA's Avatar
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    Quote Originally Posted by Y2KPewterSS View Post
    Mac mids maybe?
    Not Cali legal. Gotta be shorties. Try Edelbrock or JBA.

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    Member c5z28's Avatar
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    Shorties fit up with the stock cat's on our cars so I don't see the problem. They need to take the car to a ca state ref and through them they can make it legal so I don't see how longtubes would be a problem at that point.

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    The problem is: no headers with a CARB EO actually fit the MX-5 chassis.

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    402 Guru 402 Guru's Avatar
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    Quote Originally Posted by Jarlaxle View Post
    OK, this is a weird one: there are some guys on Miata.net trying to get LS1 Miatas legal in Kalifornia. The conversion requires a VERY tight-fitting header on the left side (steering shaft). So: does anyone know the tightest-fitting header that has a CARB certification? Many LS1 Miata guys will thank whoever comes up with one!

    (Which isn't really worth much besides karma...)
    yes they do jarlaxle...if i was in california i would buy some junkyard headers they are the only bolt on and emessions legal there if you want to get the miata past smog and titled .or u can buy some off the shelf ones and bend the hell out of them and make there flow uselesswith alought of bending the pipes but in my knowldge you can only get them to fit in a miata if you have them custom made but the easy way ike i sayed would you buy some lq4 headers off the caddy or get the zo6 headers off the ls6 that flow better than the ls1 ...and they would just bolt up and give you very compariable gains to shortty headers and be cali state legal so you can tell them you got them off an already california emissions legal car and compare the part numbers to the caddy or zo6 .
    Last edited by 402 Guru; 11-21-2009 at 03:26 PM.

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    hope that helps with your conversion post . those cars make sick #'s at the track with the right suspension

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    why not stick with stock manifolds?

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    I don't think they'll fit.

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    cutting and welding mark21742's Avatar
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    Quote Originally Posted by Jarlaxle View Post
    The problem is: no headers with a CARB EO actually fit the MX-5 chassis.
    I know older S-10 V8 conversions had one tune wrap outside the frame rail, or the opposite site of the steering shaft.
    maybe get a "legal set", then cut and swing one (or two) tubes on the other side of the steering shaft......PITA, but might just get you where you need to be

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    Junior Member insorned73's Avatar
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    Tightest drivers side Cali legal header

    Yup you got your self a set of shot intake gaskets,Any one have any other opinion??

  12. #12
    cutting and welding mark21742's Avatar
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    how sbout using a set of shorties, flip and swap them (left on the right side pointing up and back and right on the left side pounting up and back)m then a turn down.

    older Saab turbo 900's used an almost 180 you could swap shorties fron left to right and have tgem point down and forward, then use the Saab pipe to pount them back towards the rear

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    $.02 Queen OneSlowL36's Avatar
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    If the teeny tiny stock manifolds won't fit I dunno what would.

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