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If I install long headers, a cai and a straight pipe on a stock focus, then should I worry about running lean and eventually blowing a gasket? Or a piston?
 

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dosent EVERYBODY run lean from idle? I havent seen an A/F plot that dosent start out at 16:1.


Unless the CAI you use places the MAF in a tube that is too large for it, there is no reason that your A/F ratio would change.
 
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