AVAILABLE HERE: https://www.grimmspeed.com/categories...
We often get asked: "What are the best first mods to do to a Subaru?" Our answer is to replace the restrictive factory air filter and post-MAF piping. GrimmSpeed DRY-CON Replacement Filters and Post-MAF Hoses install in minutes and offer dyno-proven gains of up to 9 HP without the need for tuning!

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