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 ?
199,000 May 12 new ej257 short block, Aug 11 installed VF52 turbo, @20.8psi, 280whp, 300ftlbs. CHECK your oil, these cars use it.
Engine Build - Click Here