hey guys basically i own a Honda City 2005 M/T with 15" rims and 195 tyres...im seriously considering getting ZEX Spark plugs for it, and Splitfire ground wires to it...will i see any improvement in fuel average and pickup?...any more advantages that i can attain by these minor mods?...and does the mechanic have to adjust the tip of the spark plug in this case ZEX before installing it?.regards.