STi under aero bits
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This is a discussion on STi under aero bits within the Exterior and Appearance forums, part of the Tutorials & DIY category; The 05+ STi's come w/ some nice under aero cladding- this helps reduce lift at speed (and evidently may even ...

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    Moderating on the run! Big Sky WRX's Avatar
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    STi under aero bits

    The 05+ STi's come w/ some nice under aero cladding- this helps reduce lift at speed (and evidently may even help gas mileage a smidge)

    Here the pieces I'm talking about



    Here the parts you need

    The aero pieces are

    56411FE000 and 56411FE010, you'll also need 18 plastic clips (order 20 so you have a couple spares) 909130059 and two 6mm bolts 5770KC000 (I'd order four to have a coiple spares).

    In addition you'll need a drill, good asst of bits including 13/64ths and 3/8ths, center punch, sharpie (red worked good), a tap for a 6mmx100, duct tape

    Pics of the aero piece, plastic clips and bolts
    Attached Thumbnails Attached Thumbnails picofsideaero.jpg   clippart#.jpg   boltpart#.jpg  
    "Simplify and add lightness." - Colin Chapman

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    Moderating on the run! Big Sky WRX's Avatar
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    OK lets get started First you need the car on jack stands, the higher the better- you'll need a little elbow room. Next pick a side to start the piece are clearly marked left and right.

    You start by lining the front up and sliding it into the end of the subframe- it should stay (but be hanging)
    Attached Thumbnails Attached Thumbnails onjackstands.jpg   piecetosubframe.jpg   subframe.jpg   aeroonsubframe.jpg  
    "Simplify and add lightness." - Colin Chapman

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    Moderating on the run! Big Sky WRX's Avatar
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    Now orientate the rest of the piece- it should be vrey close to flush to the side- you'll see some half circles the piece fits around- this is where the duct tape comes in- get everything aligned nicely and duct the piece up so it stays up on it's own.
    Attached Thumbnails Attached Thumbnails sidehalfcircle.jpg   taped up.jpg  
    "Simplify and add lightness." - Colin Chapman

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    Moderating on the run! Big Sky WRX's Avatar
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    Now with everything carefully lines up (the piece fits amazing well to the contours of the chassis) mark the holes w/ your sharpie- I started w/ the two furthest back to get it secure.

    Next you'll drill- the center punch won't do you much good on most of the holes as it's got a rubber coating underneath. The two exception are the hole drilled into the subframe and the hole that will be tapped for the bolt. Use a small bit and step up to 3/8" (the holes could probably a 64th larger- but I'd rather have them tight). The pilot hole needs to be center well for the other drilling to be accurate. I used three bits for each hole (except the tapped hole)- seemed to work good.
    Attached Thumbnails Attached Thumbnails markfordrill.jpg   markfordrill2.jpg   fastenerin.jpg  
    Last edited by Big Sky WRX; 01-29-2006 at 03:22 PM.
    "Simplify and add lightness." - Colin Chapman

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    Moderating on the run! Big Sky WRX's Avatar
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    Put a couple of clips in the rear holes, do the same for the front- it should be pretty snug and in place now. Repeat for the rest of the holes, except the one I have pictured as the 6mm bolt.
    Attached Thumbnails Attached Thumbnails frontholes.jpg   picsideaerobottom.jpg  
    "Simplify and add lightness." - Colin Chapman

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    Moderating on the run! Big Sky WRX's Avatar
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    You should have nine clips in now and one remaining- you need to mark and center punch the center of the hole- use a small bit to drill a pilot and then the hole needs to be drilled to 13/64ths. You'll find your drilling through two layers of metal on this hole. After it's drilled, you'll need to tap it w/ a 6mmx100 tap. Get the tap good and straight and go slow, backing off a little every turn or two.
    Attached Thumbnails Attached Thumbnails tap.jpg   tappedhole.jpg  
    "Simplify and add lightness." - Colin Chapman

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    Registered User WRX13oy's Avatar
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    cool. how much did you get them for?
    SOCAL F4#02 OG member

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    Moderating on the run! Big Sky WRX's Avatar
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    Now the piece should be fully installed- remove it (I know it's in already) and spray spray a little primer in each hole. Let the paint dry (go start on the other side )

    That's about it- a few pics of them installed.
    "Simplify and add lightness." - Colin Chapman

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    no under view of the finished product on your car liek the original picture?

    nice write up. Now go clean your car.

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    Moderating on the run! Big Sky WRX's Avatar
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    try that one again
    Attached Thumbnails Attached Thumbnails primer.jpg   installedsideview.jpg   installedfrontview.jpg  
    "Simplify and add lightness." - Colin Chapman

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    Moderating on the run! Big Sky WRX's Avatar
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    The side peices + harware were a little over $100 total.

    I'll have a write up on the diffuser install later this week
    "Simplify and add lightness." - Colin Chapman

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    great write-up bigsky!!! thx!!

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    Registered User kessler89's Avatar
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    nice write up big sky, good god your car is dirty!! i'd like to do this to my car sometime in the near future along with the rear diffuser, i'll keep this writeup in mind
    Aspen white/gold 03 sedan *SOLD*
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    Registered User coolblue04's Avatar
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    Excellent writeup. Did you notice any difference?
    Tuned Perfection Autosports
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    Moderating on the run! Big Sky WRX's Avatar
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    Haven't even been out of town yet- got a trip planned to the "big city" -possibly this weekend. I keep close tabs on my gas mileage- I'll be sure to monitor (and report) any differences if I see them.
    "Simplify and add lightness." - Colin Chapman

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