This HKS cat - back exhaust is a perfect fit for 2015 - 2021 Subaru WRX and STI models. It brings a bunch of amazing features. First, it reduces turbo lag and improves throttle response, making your car more responsive on the road. Whether your vehicle is stock or a high - performance one with upgraded turbines, this exhaust works effectively. The exhaust sound not only meets the JASMA standard but also has a unique tone designed for the engine. It boosts both the horsepower and gives your car a great sound. Made from high - quality 304 stainless steel, it ensures reliable operation for years. The exhaust has 3' to split 2.4' piping and two 4.9' polished exhaust tips. It has a slightly louder sound at 85dB compared to the stock 78dB, but both are 60dB at idle. HKS designed it to create a dry and sporty exhaust sound that you can hear inside the car when you step on the pedal. They used a 75mm straight structure to minimize exhaust pressure while keeping you comfortable in the vehicle. Note: If you're using a stock j pipe or downpipe, you'll need the GrimmSpeed Subaru Stock DP to Aftermarket 3 in. Catback Adapter p/n 077046.
Using this HKS cat - back exhaust is straightforward. Just install it on your 2015 - 2021 Subaru WRX or STI as per the provided instructions. When you drive, you'll immediately notice the improved throttle response. As for the sound, it gives a sporty feel inside the car when you press the pedal. For maintenance, regularly check the exhaust for any signs of damage or loose parts. Since it's made of 304 stainless steel, it's quite durable, but a simple wipe - down every few months can keep it looking good. And don't forget, if you have a stock j pipe or downpipe, make sure to get the GrimmSpeed adapter as required.
