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- NGK TR6 spark plugs gapped at .035 (if you don't have them already)
- 90mm MAF housing (although I'm not sure your Roush CAI will fit it)
- custom dyno tune
the colder spark plugs plus the 90mm MAF housing along with a custom tune will net the most rwhp for the money.
you could pick up a used 90 MAF housing for under $100
8 spark plugs for $20 (change them yourself for free)
custom dyno tune = approx. $350
SCT xcalibrator II = approx. $375 (the SCT xcalibrator II is a hand-held tuner, your tuner need the SCT xcalibrator II for the custom tune)
the custom dyno tune could net up to 25rwhp
the custom dyno tune along with the colder plugs & 90 mm MAF could net up to 40rwhp.
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