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GrimmSpeed 11-14 Subaru WRX / 08-14 Subaru STI Hatch Resonated Catback Exhaust System


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With so many catback exhaust options available, our goal was to create a unique, refined sound in an extremely high-quality hand-welded system. We've been affectionately referring to it as the “gentleman's exhaust” around the shop due to its mature tone. Available in both resonated and un-resonated options, our catback will be the perfect addition for any enthusiast looking for increased performance with a sophisticated exhaust note.

Quick Specs

Custom GrimmSpeed Muffler – the design offers a deeper, more refined tone over OEM

Quad 3.5" double-wall, angle-cut tips - our most commonly requested configuration

Resonated or Un-resonated options - the choice is yours!

304 Stainless Steel construction - genuine American 304SS material to withstand the elements and abuse

1/2in thick flanges - all flanges are laser cut from 1/2in thick stainless plate for perfect sealing, easy installation and extreme durability

Flex section - your motor and mufflers are both mounted using rubber or poly mounts and can move independent of one another - if there isn't a flex section or donut gasket allowing relative movement, there's a much greater likelihood of damage to your exhaust or turbo

Custom adjustable polyurethane hangers - these hangers keep your exhaust where it needs to be, adding ground clearance, freeing you from rattles, melted bumpers and so on

TIG welded - each catback is hand TIG-welded just across the hall from the engineering offices that they were designed in, ensuring craftsmanship that does our Lifetime Warranty justice

GrimmSpeed Lifetime Warranty - buy knowing that we stand behind our products and customers 100%

Included Components

1x Quad-Tip Muffler Section

1x Intermediate Pipe

1x Midpipe (Resonated or Un-resonated)

4x Two-position Poly Exhaust Hangers

ALL Necessary Gaskets and Hardware

2x GrimmSpeed License Plate Frame

1x GrimmSpeed Decal

This product can expose you to chemicals including Lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to