Martinoledad,
I think it would be safe for me to assume that between 87+91 that there would be a 10hp difference with 87 being the lessor of the two.
2004-2008
5.4 3V up to 35hp+ on 91-93 custom tune. STOCK ONLY
5.4 3V up to 25hp+ on 87-89 custom tune. STOCK ONLY
4.6 2V up to 20hp on 91-93 custom tune. STOCK ONLY
4.6 2V up to 15hp on 87-89 custom tune. STOCK ONLY
STOCK ONLY=NO MODS INSTALLED
That's about all the numbers I know.
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