R400 Gemini Cat-Back Exhaust System w/ Burnt Titanium Tips

The Invidia R400 Gemini Single Layer Cat-Back Exhaust System, crafted for the 2015-2021 Subaru WRX STI, offers an aggressive performance upgrade. This system utilizes a Gemini configuration with independent mufflers for each tip, contributing to a more open, reactive, and louder exhaust note compared to other Invidia models like the N1 or Q300. The EJ257 engine's sound is noted to change noticeably with throttle input. Constructed from durable 304 stainless steel with mandrel-bent piping throughout, the R400 Gemini ensures optimal exhaust gas flow by minimizing restrictions. The quad exit layout is complemented by striking single-layer burnt titanium tips. This construction method keeps system weight down and allows the tips to run hotter, intensifying the titanium's color over time. Installation instructions, gaskets, and mounting hardware are included in the box. Invidia has been producing performance exhaust systems since 1999, focusing on quality materials like SUS304 stainless steel and mandrel-bent tubing. Their engineering approach designs each application specifically, leading to precise fitment. The RallySport Take highlights this system as Invidia's loudest and most aggressive option for the VA chassis STI, delivering a sound that matches the platform's reputation, though it's noted as not being for owners concerned about daily noise levels.