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Keep the MAF versus the original "barn Door." I have well over 150,000 miles on mine. Exhaust always passed the Houston air test without the cat until NOx was tested. Works great with the 964 grind cams and dual out exhaust. Autothority chip came with the MAF. With the original the engine doesn't run near as well. Only failure which was hard to track down was the potentiometer began failing. The engine would suddenly quit for a couple seconds or more but always started back up. $90 later and back on the road. No symptoms like your 911 though.
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1987 Guards Red Targa, cams, exhaust, MFI intake, lowered, 7 and 8's, 200,000 plus miles of smiles
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