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question... how much would it cost me to rebuilt the engine and to do porting on my N/A? fortune...?? :confused:

I've recently replaced my old factory intake and exhaust to HKS intake and double MAGNAFLOW exhaust. I'm wondering how much hp should I gain with this modification.. thanx much (hi) P.S. I own a 1986 RX7 FC3S N/A it has 100K miles. I didn't put the headers, but I'm planning to do so in near...