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Walker Cat /Thread.
Aircare doesn't care if you have a proper exhaust on the car. As long as it has a cat, they'll run your car without any issues.
My MR2 has minor bolt ons, and all I did to pass airecare, was a simple tune up, Stock BPV + a Walker Cat. I didn't even do anything to make it look stock. Cut a flange at work, guesstimated the angle, welded it on. Brought it to a friends place to install, and I was at aircare the next morning. Passed with flying colours. It bolted on after the Midpipe in the Muffler section
Previous attempt with just stock BPV + tune up got a fail, and 3S's are apparently easy to pass.
All said and done, It only cost me $80. Not including all the fluids and misc work I had to do after purchase.
Stock Cat/Test pipe?
Cut up some flanges, stick a Walker in there. Get that fucker HOT before even getting in line for aircare. Keep it hot.
BOV?
Either recirc it, or stick the stock one back on.
And as for plugs, get coppers! They're $2 a pop. Cheap, fresh, disposable.
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