The 86 upper does have smaller runnrs than the 87+ intakes - get your buddies upper. The lowers are the same and are the real cork in the stock intake. Check the link in my signature on the potential HP gains from porting the stock lower.
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Tom (Torque) Moss
88Gt 5spd Vert, FLowmaster Catbacks, stock cam advanced 4° @ 108.5° ICL, NMRA prepped GT40P heads 1.85/1.55 valves and 1.7 rockers, MAC P headers Jet-Hot coated, 97 Exlporer intake (ported lower), TB and injectors. 277RWHP/330RWTQ (SAE).
http://www.fastlanecars.com/
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