Full Replacement Rear Diffuser for Si sedan

?
  1. OE is fine as is

    8.8%
  2. Single Tip, Center Exit (OE or aftermarket), need only a more aggresive diffuser

    6.4%
  3. Dual Tip, Center Exit

    42.4%
  4. Dual Tip, Spaced Exit

    20.0%
  5. Quad Tip, Center Exit

    4.8%
  6. Quad Tip, Spaced Exit

    16.8%
  7. Triple Tip, Center Exit

    0.8%
  8. Dual Interesting Tip Design (27won style, rectangle, oval etc.)

    0 vote(s)
    0.0%
  1. CanadiaegeanBlue

    CanadiaegeanBlue Senior Member

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    Hey all,

    I'm not a huge fan of the HDMI port exhaust tip on the Si. Dual Tips are the easy solution, but it leaves too much blank space on both sides. Are there any aftermarket replacement diffusers currently available or incoming that would replace the OE unit?

    Picture for reference, including a render that I have seen online
    Si sedan rear diffuser.png

    --

    Here's the three replacement variants I can think of:

    - Diffuser that surrounds the OE single exhaust tip (see Lamborghini Aventador picture)

    aventador-s_green_063-816x544.jpg

    - Diffuser that reduces the space and allows one to comfortably run dual 4" exhaust tips (see Mazda Miata picture)

    242d57ac82aa3f913236bca238479df3.jpg

    - Diffuser that let's you switch to a quad tip setup (see BMW M2 picture)

    bmwf8710.jpg

    --

    Would love to see a vendor offer these full replacement options. Any insights appreciated. Thanks!
     
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  2. mjdecker

    mjdecker Senior Member

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    Been working on various ideas on this for some time... I'd love to get the exhaust out of those fake vents and have the diffuser contain no exhaust cutouts (though there's issues of heat on the plastic, what's behind the vents I think is a metal bumper so that will need to be cut into, ect)...

    VentConcept2.jpg

    I may experiment with a more aggressive diffuser but so far, I'm liking this.
     
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  3. OP
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    CanadiaegeanBlue

    CanadiaegeanBlue Senior Member

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    #3 CanadiaegeanBlue, Apr 27, 2018
    Last edited: Apr 27, 2018
    Have seen this one before, and I'm so-so on the idea, but that's just my personal taste. Perhaps with more pictures/angles I might like it better. Thanks for sharing :)

    The R8 has a similar-looking setup, but you can see how well integrated the tip design is to fill in that space. Perhaps someone can find a tip that will fit nicely in that space!

    R8 exhaust.JPG
     
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    CanadiaegeanBlue

    CanadiaegeanBlue Senior Member

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    Interesting, haven't seen this so far! Unique for sure
    Interesting! Liking the diffuser, and waiting to see if anyone will be doing that.
     
  5. a c i d.f l y

    a c i d.f l y Senior Member

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    #5 a c i d.f l y, Apr 27, 2018
    Last edited: May 9, 2018
    Am I the only one that feels the bumper port exhaust looks absolutely ridiculous? I really dig the diffuser look, but the pipes coming out of the bumper clearly contrast with the intended design of the rear end.
     
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    CanadiaegeanBlue

    CanadiaegeanBlue Senior Member

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    I agree. If it can be disguised as well as the R8 picture I shared above, then it'll be good looking.
     
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    CanadiaegeanBlue

    CanadiaegeanBlue Senior Member

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    The more traction this thread gets, the better the chance of that happening as vendors will take notice :)
     
  8. a c i d.f l y

    a c i d.f l y Senior Member

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    This is the style I like best so far, if the diffuser fins were thinner and longer that'd be awesome... Quad tips isn't bad, either, just reminds me too much of an M3.

    Screenshot_20180423-035912_eBay.jpg
     
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    CanadiaegeanBlue

    CanadiaegeanBlue Senior Member

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    See that's a pretty good one; just need one that is Si Coupe and Sedan-specific.

    The quality on that unit does look 6/10 with the fitment, and I agree diffuser fins should be narrower longer. Dual tips of Quad tip options should both be available
     
  10. SangreRaven

    SangreRaven Senior Member

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    I have seen a lot of their stuff out there over the years. Pretty much everything they carry is very $$$ not sure on the quality as I have never seen any of it in person.

    -R
     
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    CanadiaegeanBlue

    CanadiaegeanBlue Senior Member

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    Dual Tip, Center Exit is in the lead. This is valid market research for any vendors watching the thread!

    Keep the votes and comments coming :)

    Exhaust Poll.JPG
     
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    CanadiaegeanBlue

    CanadiaegeanBlue Senior Member

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    Just thought about the ATS V, and realized it too has a diffuser and exhaust setup that would look good on the Si!

    ATS V Rear Diffuser 1.JPG ATS V Rear Diffuser 2.JPG
     
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  13. mjdecker

    mjdecker Senior Member

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    I especially like the idea of a backup/brake light integrated in it as well.
     
  14. Lazz

    Lazz Member

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    I like this one. Lookslike it fits in the space of the factory diffuser but extends down and fills it out.79203_1806724689642367_3862110269886955520_n.jpg?ig_cache_key=MTUyOTE0MjYzNTg2NDA0OTE3MQ%3D%3D.2.jpg
     
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    CanadiaegeanBlue

    CanadiaegeanBlue Senior Member

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    A bit too wild for my taste, but for a show car it's not bad at all!
     
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