Invidia Gemini R400 Cat-Back Exhaust - 2015-2021 Subaru WRX / STI Tip:Stainless Steel 4K front and 4k rear

4K front and 4k rear default spring rate

Will the backing damage my carpet

which is why the car feels more responsive and is able to accelerate faster through the gears

but inside the car it can be a little underwhelming

Invidia Gemini R400 Cat-Back Exhaust - 2015-2021 Subaru WRX / STI Tip:Stainless Steel 4K front and 4k rearChoose from two tip options: Titanium or Stainless Steel Installing an Invidia exhaust is a great way to improve horsepower, performance, weight reduction, and exhaust sound. Made from T304 Stainless Steel, this exhaust reduces weight while giving you additional strength to reduce the potential for cracks and breaks along with rasp and vibration. Optimized flow for minimal back pressure for performance gains. You'll get a great sound and tone from