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question about spark plugs
hey i figured since im about to go ahead and install long tube headers that i should just change the plugs while im under there but i was wondering what gap size i should get as far as like .40 and .55? whats the difference? is one better than the other? thanks for the help in advance. 
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2002 SOM Z28 A4
K&N fipk, descreened maf, slp fan switch, 160 thermo, umi stb, spohn adj torque arm, spohn adj phb, spohn adj lca's, msd wires, msd coils, ngk plugs, P/S long tubes, P/S y pipe, slp lm II, UMI sfc's, performabuilt lvl2, pcmforless tune, yank ss3200 stall, and trans cooler....
"if you want peace prepare for war"
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