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Invidia Gemini Single Layer Cat Back Exhaust w/Stainless Steel Tips (Part Number: )
Invidia Gemini Single Layer Cat Back Exhaust w/Stainless Steel Tips (Part Number: )
Invidia Gemini Single Layer Cat Back Exhaust w/Stainless Steel Tips (Part Number: )
Invidia Gemini Single Layer Cat Back Exhaust w/Stainless Steel Tips (Part Number: )
Invidia Gemini Single Layer Cat Back Exhaust w/Stainless Steel Tips (Part Number: )
Invidia Gemini Single Layer Cat Back Exhaust w/Stainless Steel Tips (Part Number: )
Invidia Gemini Single Layer Cat Back Exhaust w/Stainless Steel Tips (Part Number: )
Community Media
Invidia Gemini Single Layer Cat Back Exhaust w/Stainless Steel Tips (Part Number: )
Invidia Gemini Single Layer Cat Back Exhaust w/Stainless Steel Tips (Part Number: )
Invidia Gemini Single Layer Cat Back Exhaust w/Stainless Steel Tips (Part Number: )
Invidia Gemini Single Layer Cat Back Exhaust w/Stainless Steel Tips (Part Number: )
Invidia Gemini Single Layer Cat Back Exhaust w/Stainless Steel Tips (Part Number: )
Invidia Gemini Single Layer Cat Back Exhaust w/Stainless Steel Tips
Subaru WRX/STI 2015+
Read 9 Reviews | 4 Q&As
Part # HS15STIGM4SS
$962.26
msrp: $1,447.00

In stock! Ships same day

Features & Product Details

RallySport Direct is proud to carry the Invidia Gemini Single Layer Cat-Back Exhaust System. The Gemini is among one of the most popular cat-back exhaust systems available as they make for an excellent upgrade over the OEM exhaust system to improve the performance and the sound. The combination of increased piping diameter along with smooth bends relieves the exhaust with restriction and turbulence under acceleration which will increase the horsepower, the torque, all while improving the throttle response and reducing the turbo lag.

Here are the key features:

  • Stainless steel quad exhaust tips
  • 4" Tip sizing
  • 304 stainless steel materials
  • 3" piping diameter
  • Exhaust hangers welded on to the OEM locations to allow for a direct fitment
  • New gaskets and hardware included making this exhaust system ready for the installation
  •  

    Specifications

    Brand: Invidia
    Exhaust Orientation: Straight Exit
    Installation Hardware Included: Yes
    Piping Coating: No
    Piping Flex Joint: Yes
    Piping ID: 3.00in
    Piping Material: 304 Stainless Steel
    Piping Taper: No
    Silencer Included: No
    Tip Material: Stainless Steel
    Tip Qty: 2
    Tip Shape: Round
    Tip Size: 4.00in
    Mfgr. Warranty: 1 Year
    Condition: New Product
    Return Policy:

    RallySport Guarantee - 30 Days


    Items that are covered under the RallySport Guarantee offer a 30 day no questions asked return policy.

    RallySport Guarantee items may be returned within 30 days of the original invoice date and must include all the original parts and contents for a refund.

    The RallySport Guarantee does not apply to products that have been modified, damaged, misused or abused. All returns require an RMA (Return Merchandise Authorization) Number, and freight charges are strictly non-refundable. For more information regarding our freight refund policy, please refer to our return policy page found HERE.
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    PEOPLE WHO VIEWED THIS ITEM ALSO VIEWED

    REVIEWS & CUSTOMER MEDIA

    9 Reviews
    4.8 out of 5 Stars
    5 Stars
    (7)
    4 Stars
    (2)
    3 Stars
    (0)
    2 Stars
    (0)
    1 Stars
    (0)
    Customer Photos and Videos
    Invidia Gemini Single Layer Cat Back Exhaust w/Stainless Steel Tips ( Part Number: HS15STIGM4SS)
    Invidia Gemini Single Layer Cat Back Exhaust w/Stainless Steel Tips ( Part Number: HS15STIGM4SS)
    Invidia Gemini Single Layer Cat Back Exhaust w/Stainless Steel Tips ( Part Number: HS15STIGM4SS)
    Invidia Gemini Single Layer Cat Back Exhaust w/Stainless Steel Tips ( Part Number: HS15STIGM4SS)
    Invidia Gemini Single Layer Cat Back Exhaust w/Stainless Steel Tips ( Part Number: HS15STIGM4SS)
    ROARRR400 3 months ago
    5out of 5stars

    Exhaust appears to be well made. I originally used this with the Grimmspeed J pipe adaptor, however I cannot stand the look of the tips sticking out an extra inch to 1.5 inch with the adaptor so I removed it and used the flat gasket to my stock J pipe. So far it hasn’t leaked and I’m keeping a good eye on it and it looks way better. When I first installed it, it was too “loud” for me. After a while, when I forget I have an exhaust, it isn’t bad and I like it. But you will always know it’s there. It drones between 2.5k to 3.3k, once you go above that it mellows out. On the highway, it does not drone, it lightly hums and I can barely hear it. If you’re heavy on the throttle during take off, commute in traffic like LA, drive with a full carload of people, and occasionally want the exhaust to “disappear”, I’d say get something quieter. If you enjoy driving the canyons, downshifting with some pops, using sound to gauge your RPM’s, Revving up just because racecar, and to stand out, this is for you. I went from stock, to nameless muffler deletes, to the factory SPT/ STI upgraded exhaust, to this R400. Sound is DEEP on my 2015 WRX (Non-STI). Still haven’t decided if I prefer this R400 or the Q300. But based on Invidia’s design and intention of this exhaust, it’s solid.
      
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    Great Sound and Easy to Install 6 months ago
    5out of 5stars

    Let me first say that I have a "stock everything" 2018 WRX, so my experience might be different than yours if yours is tuned or what have you. Anyways, when cold started, this exhaust has a low tone and is very rumbly. Sounds great inside and outside the cabin. On a warm day, around 3000rpm in 3rd, the noise from the exhaust in the interior is very loud, almost a little too loud to have a conversation, but that's what I was looking forward to about this exhaust. On the highway, the sound is basically gone unless you gun it, and then it sounds great. I have actually heard this exhaust on an STi as well, and I kinda like it better on the WRX. It sounds more rounded, and more rich than I feel like it did on an STi. In terms of the installation, it took about 45 minutes with minimal effort. I've never done an installation like this, and following Youtube vids and a little help from a friend, the old exhaust was out and this was in. I will say that it's like, 5x heavier than the stock exhaust, and the tips are huge, but overall, it really enhances the looks of the car from the rear. Overall, I mean, I don't have much experience with other exhaust systems, but this one is pretty damn cool. Sounds good, looks good, and really enhances the experience of owning a WRX. Well worth the money, imo.
      
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    Great sound, easy installation 1 year ago
    4out of 5stars

    First, the delivery of this product was top notch and I am very happy with the purchase and dealings with RSD during and after the purchase. Second, the installation of this was very simple, especially after finding a video on youtube by someone who went through the process already. Unbolt, lube, and slide off the old exhaust from the CAT back, and then start installation of the new from the back front and it all goes together easily. Just make sure to get the correct adapter plate, if you need one, to connect to the downpipe. Lastly, the sound is fantastic! To give a sense of similarity, if you have heard the SPT exhaust on the 15's on, then you have heard almost exactly what this sounds like, only a little deeper. People can tell when you start your car. There is a low drone internally if you are driving for a while that could get to you. It might just be my installation, but at some point the sound has a reverb sound as if you are driving with one window down and getting that buffer feel going. Overall, very happy with my selection and would definitely do it again if given the option and would definitely suggest to anyone interested in it to enhance your sound to get this.
      
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    2 of 2 people found the following review helpful
    Worth Every Dollar 1 year ago
    5out of 5stars

    I purchased the R400 a few months ago. It did get it when there was a sale because it's a bit pricey, but I assure you it's worth every dollar. The packaging was very protected and well wrapped. The installation was very straight forward with the exception of the connection to the downpipe which fits a little funny, but it turned out just fine after messing with it for a while. The pipes line up perfectly and they look incredibly aggressive. Once the exhaust settles in it's got such a deep, rumbly tone. It pops quite often and it can get pretty loud when you floor it. The drone is noticeable, but in my opinion is not unbearable. It doesn't bug my wife so that's got to say something lol. it is just overall a wonderful product and I recommend to anyone looking for a quality exhaust.
      
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    1 of 1 people found the following review helpful
    The One 2 years ago
    5out of 5stars

    You guys, it's perfect. I was apprehensive to purchase any exhaust system for my '18 WRX. I'm 26 years old, a young professional and needed a mature sounding exhaust note. I was between the Invidia R400, Q300, and the Cobb CBE. I'm glad I didn't get the others. The Q300 just seemed like it wasn't "doing it" for a lot of people (in terms of hitting the perfect note). The Cobb was slightly more than I wanted to spend, although I'm sure the quality is outstanding. The R400 is exactly what I look for in my exhaust. Aesthetically, it's a beautiful piece. I opted for the polished silver tips. I had this professionally installed at a local shop here in West Chester, PA. I can't comment for ease of install, but the fitment is perfect and fills the rear valance nicely, as other reviews have stated. The sound (in my opinion) is not like other exhausts available for our vehicles. It is a choir of badass angels. The tone is deep, you get pops (not as loud as N1 pops) on perfect shifts and rev matches. Normal driving is very pleasant and the volume is sporty, yet reasonable. Highway driving is also pleasant and drone is minimal. It'll scream if you lay into it, and it will drone a little between 1500-1800 rpm, especially on cold starts. It will be heard, but so far, it hasn't attracted any unwanted attention. The R400 is doing this boxer engine a decent favor.
      
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    QUESTIONS & ANSWERS

    • Q: Comparison  STAISAC6 months ago

      Which is the difference compared to HS15STIGM4XS
      • 0 of 0 people found the following answer helpful

        A:  That is not a part number that we've got in our system. There is a very similar exhaust made by Invidia that is made with burnt titanium tips instead of stainless steel though, I'm assuming that's what you're referring to.

        Marcus E. @ RallySport Direct 5 months ago  
          
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    • Q: 2019 wrx sti???  gajewskimichal8 months ago

      DOES THIS EXHAUST SYSTEM FIT FOR 2019WRX STI???
    • Q: Adapter fitment  R.P.11 months ago

      I see the above question about the adapter with a 2017 sti. But just wanted some further clarification. I buying for a 2019 sti so assuming the condition of the downpipe to cbe gasket is basically new on my car, an adapter wouldn't be needed to install this exhaust?
      • 0 of 0 people found the following answer helpful

        A:  You are still going to need an adapter, as the downpipe is a different diameter. Also this exhaust is not confirmed for 2019 as of yet.

        Devan M. @ RallySport Direct 11 months ago  
          
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    • Q: Fitmet concerns for Invidia exhaust   JoshD2 years ago

      I have a 2017 Sti, will i need to purchase an adapter from the stock DP to the Invidia catback? Also, will i need to purchase a donut gasket as well?
      • 1 of 1 people found the following answer helpful

        A:  An adapter would be highly recommended when installing with the stock downpipe. Its never a bad idea ether to use a new donut gasket but it being required would be dependent on the condition of the gasket that is installed now.

        Evan M. @ RallySport Direct 2 years ago  
          
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