Shopping Cart

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

Regular price $897.50 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 39 reviews
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+

Awesome exhaust

Totally impressed and I’m very satisfied with this purchase. Ridiculously easy to install. I’m using the oem downpipe so I bought the Grimmspeed adapter and a put in a new donut gasket while I was at it. Craftsmanship is top-notch. Exhaust itself is not too loud at all. I was very reluctant to purchase this with a new amendment to the exhaust laws in California. But if you get pulled over for this exhaust, you’re either driving like a complete maniac or the police officer is very bored. Gives a deep tone that lets you know its there, especially when you get on it with a downshift or getting on the freeway or passing. Not raspy at all, Does have a little bit of a drone at about 2500 RPM at 65 to 75 mph in 6th gear, but nothing more obnoxious than the road noise WRXs have and can’t be fixed with a decent audio upgrade. Definitely makes the car more fun to drive and makes it sound like it should. As for IIR: Absolute best price I found for this exhaust. Shipment was lightning fast, even to the west coast. Definitely going to be doing business with IIR in the future.

Thanks so much Adam! We are happy you are enjoying it so much. Nice review, that'll definitely help others with this product. Anything we can ever do for you, please let us know! Best, Josh
Best Exhaust

Perfect deep tone. Easy to install. Couldn't be happier.

Music to my ears!

Easy bolt on stuff to the Sti. had all the hardware needed for an easy install.