Exhaust\downpipe connections
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This is a discussion on Exhaust\downpipe connections within the Engine Modifications forums, part of the Tech & Modifying & General Repairs category; Hey everyone. I want to invest in a Invidia q300 exhaust and some people told me I will need some ...

  1. #1
    Registered User SubieLouv's Avatar
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    Exhaust\downpipe connections

    Hey everyone. I want to invest in a Invidia q300 exhaust and some people told me I will need some gaskets I believe or connections to use. Not to engine\part savy.

    I will also want to invest in a catless downpipe later on but for now I have the stock downpipe.

    Side note I will habe my stage 1 installed next week before getting the exhaust and downpipe.

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  3. #2
    MAINEiac 11blackSTi's Avatar
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    The Invidia Q300 should come with all the gaskets that you need for your installation of the catback. However, I do believe that you will need a 2.5" to 3.0" adapter kit to mate up to your stock downpipe (GrimmSpeed OEM Downpipe to 3in Cat Back Adapter Subaru Turbo Models 077046 at RallySportDirect.com). I have never done an install of this exhaust to a stock DP, so someone could probably confirm this for you.

  4. #3
    Registered User SubieLouv's Avatar
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    Ok cool deal. Thanks soo much.

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    The Guy On The Couch TownLine500's Avatar
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    Quote Originally Posted by 11blackSTi View Post
    The Invidia Q300 should come with all the gaskets that you need for your installation of the catback. However, I do believe that you will need a 2.5" to 3.0" adapter kit to mate up to your stock downpipe (GrimmSpeed OEM Downpipe to 3in Cat Back Adapter Subaru Turbo Models 077046 at RallySportDirect.com). I have never done an install of this exhaust to a stock DP, so someone could probably confirm this for you.
    Hey!
    You would need the adapter 2.5-3.0 kit. I have a buddy that runs a custom exhaust shop. For mine we cut off the part that tapers down, and my friend made his own 3" adapter then welded it in place. This is the way to go if you have the option. I do like the Q300, but I liked the N1 better. It sound awesome with a down pipe. If you haven't already look into N1, I would check it out. My issue with Q300 is I don't like the double tip, the N1 is single tip. I did not use silencers and car is not that loud. And if you see a cop put it in neutral and it is silent. Either way Subielouv let us know how you make out.
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  6. #5
    Registered User SubieLouv's Avatar
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    Yeh I was planning on getting the exhaust before the downpipe. But it wouldn't be too much longer that I would get the downpipe. Just my paychecks can only pay for so much before I'm eating Ramen Noodles for a month haha. But yeh I'll compare the q300 and the n1

  7. #6
    The Guy On The Couch TownLine500's Avatar
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    You would see more power gains if you do DP first. Do you have a Cobb AP? When you get the DP spend the extra money for a catted. Cat less can tend to over boost, and also trip CL. I have a Cobb catted DP and N1 exhaust. It sounds amazing. Also what state are you in? Can you get away with cat less and still pass inspection?
    So it really depends on you priority sound or performance. Plus the N1 costs less than Q300 and with the savings buy a catted DP. Also do you have an aftermarket intake? If not grab a K&N high flow air filter there cool on any Subaru. And what did you mean about stage1 installed? Stage 1 on these is just a map, or did you get something else as well? That's just my 2 cents.
    Last edited by TownLine500; 07-25-2014 at 11:02 AM.
    STINK EYE MOB #500

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  8. #7
    Registered User SubieLouv's Avatar
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    I Live in louisiana and we can pass inspections with a catless DP. I habe cobb stage 1 kit with the v3 AP coming in this week.

    So once I habe the stage 1 kit set up. My next step was gonna be the DP and exhaust. So wasn't sure which to get first between the DP and the exhaust.

  9. #8
    Registered User SubieLouv's Avatar
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    Or if I could save a bit longer and get both at the same time that would seem to be easier

  10. #9
    Registered User SubieLouv's Avatar
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    Both DP and exhaust I mean at same time

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    Couple things... First, the Cobb OTS maps only support catted downpipes, so keep that in mind if you are indeed going to go catless. You'll definitely need a pro tune/e-tune if you want to do that plus you can run into boost creep issues like TownLine mentioned. I know it doesn't get that cold in LA but it might get just cold enough to cause issues. A good tuner can generally stop this but they may want to you to invest in a EBCS (GS or Cobb) or perhaps a MBC. Just some food for thought.

    Next, yes it would definitely make your life easier to just do both at once though it's not that big of a deal. If you'd prefer to get the catback sooner for the sound, go for it. You'll just have to disconnect it when you install your new DP but that's not a big deal. It's really just a preference thing, it'll work just fine whichever you decide on doing.

  12. #11
    Registered User SubieLouv's Avatar
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    Ok cool ill make sure I'll look up all that stuff

  13. #12
    The Guy On The Couch TownLine500's Avatar
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    Down pipe first trust me. Unless your buying a package it doesn't matter price wise. Others may disagree but get a DP with a CAT!!!
    Otherwise you will constantly have to datalog and monitor boost creep. Even after I had mine protuned, it still over boosted a little and map had to be adjusted. My buddy is running cat less on a 13 hatch, his CL is always on and when I use my AP to diagnose it says bank 1 cat error. A protune will take care of cat error and boost creep you might be getting. Did you get AF intake? You have to tune with your AP before you start car after installation.
    STINK EYE MOB #500

    2009 Subaru Impreza (I bought it new for my Mom)
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    1996 Honda Civic Lx
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  14. #13
    Registered User SubieLouv's Avatar
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    The cobb stage 1 kit comes with a sf air intake

  15. #14
    The Guy On The Couch TownLine500's Avatar
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    Did you get the box? I waited but it is totally worth it. The SF by itself gets a lot of heat from engine compartment. Get a aftermarket heat shield to. I have a GrimSpeed heat shield that goes over my PTP turbo blanket. The box keeps air filter segregated from engine compartment, and gets fed through stock snorkel. Makes a difference keeping heat out. I also wrapped the outside of my Cobb airbox with DEI reflectagold. But I can't stress enough to run data logs so you know how things are running.
    STINK EYE MOB #500

    2009 Subaru Impreza (I bought it new for my Mom)
    2004 Subaru WRX (Sold)
    2013 Subaru WRX Premium
    1996 Honda Civic Lx
    WRX genuine Face Ripping ACCELERATION!!!

    My Boston Beat Down Build Thread
    http://www.clubwrx.net/forums/builds...wrx-build.html

  16. #15
    Registered User SubieLouv's Avatar
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    Yeh the sf air intake came with the box that covers it

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