S&B Filters KF-1000D S&B Intake Replacement Filter Dry Extendable CORE-50 We've also removed the muffler

We've also removed the muffler that's integrated into the stock pipe to further improve flow and add some induction noise to your Cummins

Slashes back pressure up to 94 Percent

All that steel minimizes front end flex

This mates with our mandrel-bent aluminum inlet pipe to provide superior airflow over stock and gives your WRX a more aggressive tone under acceleration

but with that big power you also get a lot of heat

S&B Filters KF-1000D S&B Intake Replacement Filter Dry Extendable CORE-50 We've also removed the mufflerReplacement Filters For your SB Cold Air Intake are available with cotton (Cleanable) or dry (Extendable) filter media. Both offer similar performance characteristics, so the decision comes down to how you want to maintain your filter. Dry (Extendable)Performance is comparable to cotton (Cleanable) filters. Extend the life of the filter by blowing it out with compressed air(up to 3 times) and then discard. Ideal for dry, dusty driving conditions.