Guessing you have a catless up pipe on the car already ?
Most level it in the old up pipe, you should be able to get it out with a wrench and some PB Blaster.
Do you have the 2.2k ohm resistor to defeat the CEL ?
225,000miles 5/2012 ej257 short block, 8/2011 installed VF52 turbo, @20.8psi, 280whp, 300ftlbs. CHECK your oil, these cars use it.
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