..was Just Wondering If Anyone Out There Owns Either Of These Handheld Tuners And What Kind Of Hp Gain I Can Expect To See On A 98' Z28. Is One Actually Better Than The Other?? I Was Also Wondering Why They Don't Make Very Many Handheld Tuners For The 98 Model Year As Opposed To 99-o2 Model Years. Any Help Appreciated.....thanks:d