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Invidia R400 Gemini Single Layer Quad SS Tip Cat Back Exhaust Subaru WRX / STI 2015-2019

Regular price $892.50 Sale price

Compare at $964.60



In stock, no waiting! The Invidia R400 Gemini Single Layer Quad SS Tip Cat Back Exhaust for your Subaru WRX / STI 2015-2018 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
Pipe: 76mm
Tip: 101mm
Resonated mid-pipe


Note: Are you using a stock j pipe or downpipe? If yes, the GrimmSpeed Subaru Stock DP to Aftermarket 3 in. Catback Adapter p/n 077046, is required.


Customer Reviews

Based on 42 reviews
Best decision yet.

I paired this R400 with a Grimmspeed catted Jpipe and the sound is how my WRX should sound stock. The car is so much more fun to drive and just feels so much better overall. And the guys at IIR are the best, got my exhaust and jpipe within 4 days!

Snap. Crackle. POP.

I cannot get over how this sounds. I wanted something that was louder than stock but that doesn't ruin my daily commute (100+ miles round trip). Plus with kids I didn't want them needing hearing protection when the windows were down. This truly the perfect blend of sound and volume. Its throaty, it has a nice little burble (without the god awful tuner induced back firing) and a good pop when you hit that perfect shift.

Best catback on the market

Great exhaust . This is actually the 2nd invidia r400 catback I have gotten from you guys. I got one for my 2014 sti and one for my 2019 wrx .

Thanks so much Craig! Glad to see you are enjoying a great product and our services! Thanks for coming back! Josh
Great product and speedy shipping.

Once the R400 breaks in, man does it make the FA motor come alive. Deep rumble with some crackles and pops. Highly recommend. IIR had this to me in 4 days! Will definitely purchase here again

Exhaust is so clean!

I literally typed in best exhaust for 2019 Wrx and this one popped up on this site for the cheapest price. This has turned out to be the best decision I ever made. I love the way it looks, sounds and feels on my car. A+