Claw Posted June 24, 2021 Share Posted June 24, 2021 After running with a Stromung since the msprank's GB I'm thinking of going back to a stock cat-back for a change. What gaskets am I going to need? Looking at Opposed Forces: - Grimmspeed 2.5" to 3" converter with a Subaru donut (#38) - 3" gasket for converter to OEM catback - 2x 2.5" gasket (44011AE01A) for the mufflers Link to comment Share on other sites More sharing options...
Max Capacity Posted June 24, 2021 Share Posted June 24, 2021 Do you have a stock DP ? I have used the Grimmspeed 2X thick 3" gasket to from the Invidia DP to stock midpipe, I put a bead of red RTV on the gasket, let it tack up then install. The adaptor will work too if you have a 3" dp. 305,600miles 5/2012 ej257 short block, 8/2011 installed VF52 turbo, @20.8psi, 280whp, 300ftlbs. (SOLD). CHECK your oil, these cars use it. Engine Build - Click Here Link to comment Share on other sites More sharing options...
Claw Posted June 24, 2021 Author Share Posted June 24, 2021 Thanks Max - No, I have a CNT downpipe - I believe the tail end is 3". Link to comment Share on other sites More sharing options...
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