GrimmSpeed Subaru Reverse Downpipe Adapter User Manual
Factory Downpipe
Factory Donut Gasket
GrimmSpeed Adaptor
GrimmSpeed 3in Gasket
Aftermarket Catback
GrimmSpeed Install Guide Series
Installing the GrimmSpeed Reverse Downpipe Adaptor
Updated 2/5/13
Introduction: This guide will illustrate the installation of the GrimmSpeed Reverse
Downpipe Adaptor. This adaptor will help you mate your stock downpipe to an
aftermarket 3in catback while still properly using the factory donut gasket.
Tools: The tools listed below are suggested for this task (figure 1). You will also
need wrenches for whatever hardware you’re currently using for the DP to Catback.
- 14mm socket or wrench
- 17mm socket of wrench
- Ratchet
Tips: Clean gasket surfaces thoroughly to ensure a great seal!
Procedure:
1. Begin by collecting your tools safely raising your car.
2. With your downpipe and catback fully installed except for this junction,
assemble the gaskets and adaptor as shown below.
3. Use the provided hardware along with your 14mm and 17mm wrenches to
tighten each side, moving back and forth to tighten them both evenly. This is
important to ensure a good seal with both the donut gasket and the multilayer flat gasket.
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