Pre 99.5 use a different knock sensor and also have egr. You can use your manifolds and eliminate the egr. The knock sensor must be changed and it can be a pain to do so. Just ask smurf.
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72 442 "THE BEAST", 99 Alero - OSV Replica w/ original OSV parts, HURST Dual/Gate Shifter
Beware of the BackStabber

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