Part #: 140418. Borla exhaust systems use patented straight - through and multi - core tech to free up the horsepower limited by the stock exhaust. Made from lightweight, premium aircraft - quality T - 304 stainless steel, they offer top - notch performance and durability. Ultra - smooth mandrel bends and 3 - inch piping maximize flow and power. Precision CNC manufacturing guarantees an accurate fit. Borla backs these exhausts with an exclusive Million - Mile Warranty, meaning your exhaust will outlast your car! Note: If you're using a stock j pipe or downpipe, the GrimmSpeed Subaru Stock DP to Aftermarket 3 in. Catback Adapter p/n 077046 is required.

Using your Borla ATAK Cat - Back Exhaust is easy. Just install it following the included instructions. It's designed to fit precisely on your 2011 - 2014 Subaru Impreza WRX/STI Sedan. If you're using a stock j pipe or downpipe, remember to get the GrimmSpeed adapter mentioned earlier. For maintenance, regularly check the exhaust for any signs of damage or loose parts. Since it's made of high - quality stainless steel, it's pretty durable, but cleaning it occasionally with a mild stainless - steel cleaner will keep it looking great. This exhaust comes with a Million - Mile Warranty, so you can drive with confidence knowing it's built to last.