As with other mods, many times the benefits comes from the combination of various mods, rather from the simple addition of each improvement. If you have no other mods. probably your car will run smoothly, a very little more crispier on acceleration, but IMHO no big gain. If you have a CAI, headers, sport muffler, your engine breathes better, so an ignition failure would be more noticeable, so THEN you would feel the benefit from wires and plugs.
<hr width=60% noshade size=1 align=left>Zman
H&R Springs/KYB GR2 Shocks/SR Strut Bars (F&R)
Future: CAI / BBTB