i got a 1991 Z28 with a 350 in it i checked the V# and found out that it has some kind of perfomance or sports package what is that

 

Your IROC-Z comes with a performance package called 1LE

Q: What's included in the 1LE Performance package? A: In 1988, the secret showroom stock racing 1LE option (option level 0 IROC-Z)was first available; however, only 4 were produced. Then in 1989, the option became more well-known as 111 were produced that year. The package was obtained by ordering the following:[*]Level 1 IROC-Z with 5.0 TPI engine with 5 speed or 5.7 TPI engine[*]Optional axle ratio (G92) (305/3.45, 350/3.27) and its required options[*]Air conditioning delete (C41) (standard heater)
The package originally consisted of: [ul][*]Fog lamp delete[*]Aluminum driveshaft (JG1) (part # 10085375)[*]Performance exhaust system (N10) (dual catalytic converters)[*]Special deflected disc shocks[*]Aluminum spare wheel with smaller spare tire (N64)[*]Lower control arms (part # 10164151)[*]Larger (11.86 inch) front rotors (part # 18016035)[*]Larger front spindles (part #'s 18016737 / 18016738)[*]PBR front, dual-piston aluminum calipers (part #'s 10132827 / 10132828)[*]Special swinging fuel pickup in gas tank and special 18 gallon baffled fuel tank for fuel pickup down to .5 gallon reserve to prevent fuel starvation in hard cornering[*]Some came with special 16" x 8" light alloy mesh wheels (X[/ul]http://www.thirdgen.org/IROC-Z-1LE-performance-package
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