Injen TechnologyX-1021-BB 3.5" AMSOIL Ea Nano-Fiber Black and Blue Air Filter

Good replacement filter on the focus st injen intake.

The Injen Air Filter is built well !, if you are looking for maximum air intake along with maximum filtration this is the right stuff, my old one lasted for four years, with minimal maintenance, I added the pre-filter bag onto this new filter install, should be even better!!

Same great quality as usual, but it seems like they've cheaped out a bit. The old version of the X-1021 had a filter on inside of the cylinder as well. The new one just has a big rubber bowl. This means less air... I don't know how much this effects performance, but it's still a let down.

This is a direct replacement for the Injen Intake system for the Audi S4. The product arrived within 48, and I installed it the next day. Fits great, sounds great, and easy to switch out.

Amazing shipping speed!! And great product as usual!

Excellent filter. It has an internal velocity stack at the top of the filter, if that makes a difference for what you're using this for. It also has a lip on the inside of the mounting hole that insures you don't push the filter over the pipe too far. Very convenient.

Fitted my bmw Injen intake perfect!

Got it fast got the right filter and works the way it’s supposed to !

Perfect like the original injen

Great replacement for my injen air filter. Fits my 2010 3.8 genesis GT great!