The HS11STIGTT cat-back exhaust is a top - notch upgrade for your Subaru. It fits the 2009 - 2014 Subaru Forester XT, 2008 - 2014 Subaru Impreza WRX Sedans, and 2008 - 2014 Subaru Impreza WRX STi Sedans. Key features include new gaskets and hardware, a 304 stainless - steel build for durability, 3 - inch piping diameter, 4 - inch titanium exhaust tip for a stylish look, a resonated mid - pipe, a dual - exit design, and it comes with a silencer. The exhaust hangers are welded onto OEM locations for a direct fit. The Invidia N1 offers great sound, fit, and appearance. It's super easy to install: just remove the old quiet exhaust, put in the Invidia N1, start your car. If you're using the factory downpipe, you may need a cat - back adapter from GrimmSpeed, Invidia, or Torque Solution.









Using this Invidia cat - back exhaust is a breeze. First, find a safe and flat place to work on your car. Start by carefully removing the old exhaust system. Make sure to keep all the bolts and parts in a safe place. Then, take your new Invidia exhaust and align it with the OEM locations where the exhaust hangers are welded. This will ensure a direct fit. Once it's in place, secure all the bolts tightly. When you start your car, you'll notice an immediate difference in the sound. As for maintenance, regularly check the bolts to make sure they're still tight. You can also clean the 4 - inch titanium exhaust tip with a soft cloth to keep it looking shiny. If you're using the factory downpipe, remember to get the appropriate cat - back adapter. This will help the exhaust work at its best and prevent any issues.