Kids grow up fast in the Korn family.

Kansas City, Mo. — Limp Bizkit, who were virtually unheard of when they set out on the inaugural “Family Values Tour” a year ago, have graduated from taking the stage in a giant toilet with their hands on their dicks to full-fledged arena rocking.

And the funk soul brotha leading the next generation of values is Bizkit frontman Fred Durst, who judging by the sea of backwards red Yankees caps in the Kemper Arena crowd Tuesday, has a steadfast fanbase equivalent of a B-boy Tori Amos.

Bobbing along a string of recent achievements — the phenomenal success of “Significant Other,” which has spent 15 weeks on the Billboard Top Ten; a high-profile, remarkably controversial Woodstock performance — the Bizkit were booked to replace Korn as headliners of the rap metal tour.

Armed with an elaborate factory-like backdrop, enough pyrotechnics to make Kiss fans lick their lips and a song repertoire chock-full of MTV-approved hits, Durst and crew were undoubtedly ready to step up to the task.

A chain of Midwestern dates would prove a greater challenge when Korn was added last minute as a publicity stunt to promote their upcoming fourth album, “Issue.”

But a bomb-dropping opening rendition of “Break Stuff,” including an extended breakdown of Durst whispering “I pack a chain saw/ I skin your ass raw,” let metalheads and hip-hops kids alike know it was Limp’s night tonight, baby.

“Let’s pretend tonight is the last day on earth, and we’re the only one’s left,” Reverend Durst preached, the first of several Values sermons throughout Bizkit’s set.

Goofy guitarist Wes Borland, masked and sporting a Grim Reaper cape, followed by tearing into “9 Teen 90 Nine,” a showcase of the band’s rare ability to move the crowd up and down through verses and choruses with strikingly different personalities.

“Show Me What You Got,” a mass shout out to cities and bands that have supported the Jacksonville, Fla., group, was a surprise hit — especially as Durst rapped “Limp Bizkit committee down in Kansas City.”

“Stuck,” on which Durst dueled with a female fan pulled up from the mighty mosh pit, and “Counterfeit” were the only old-school Bizkit tunes included in the primarily “Significant Other”-hyping set.

A collage of covers interrupted the final 20 minutes of the show and found Bizkit jamming on everything from staples “Jump Around,” the House of Pain crowd-pleaser the band toyed with a bit on last year’s “Family Values,” to the breakthrough single “Faith,” to Borland taking lead on Metallica, to snippets of Rage Against The Machine.

Durst made the crowd their sixth member more than any band on the bill, often climbing into the pit or leading them in lighter s‚ances and middle finger rallies.

What made the moves sincere was the timing. For instance, on “No Sex,” Durst brought a couple dozen young women on stage and weaved in and out of them, being careful not to get too close — a perfect accent on a song about avoiding sexual temptation.

Bizkit closed out the memorable set with Durst serenading the sweat-soaked arena with the mild-tempo chorus “I’ll do anything for you.” As if changing titles from sensitive crooner to tough guy rapper at the strike of a chord, Durst announced “I’ll also do anything … for the nookie!”

As a thick cloud of confetti instantly clouded the room, Limp Bizkit slammed into their token tune, letting fans know the most important Value of them all doing it for the nookie.

Durst prodigies Staind opened “Family Values” with a Korn-copped set that lacked both integrity and entertainment value. “Mudshovel” captured the band at their best, which is still a mediocre nu-metal quartet.

The Crystal Method followed, with a 30-minute sonic assault that almost made ravers out of headbangers. Almost.

But a party usually reserved for a 6 a.m. ecstasy trip taking form as a 6 p.m. coke-chugging fest never lives up to its name.

“Can’t You Trip Like I Do” was the musical highpoint, but the opening number was plagued by a bad case of reoccurring house lights.

Durst joined the electrified duo for a mid-floor rap, which provoked a major bumrush that left upper level seating areas nearly vacant by Method’s end.

With no pre-announced order, mosh pit enthusiasts went nuts when sounds of bagpipes peaked from behind closed curtains.

Bagpipes mean only one thing at a “Family Values Tour” — Korn.

However, Jonathan Davis, the band’s viciously aggressive frontman, didn’t enter toting his Scottish instrument. Rather, the band kicked off with the mood-setting “Blind.”

“Are you readyyy …” Davis blared, launching his mates into a set heavy on hits, including “Freak on a Leash,” “A.D.I.D.A.S” and “Got the Life.”

While there was no “Shoots and Latters,” the band rocked old school with “Fagget,” the peak of a flawless performance.

The nu-metal pioneers debuted two new tunes, both of which could have been plopped onto past efforts.

Filter took on the daunting task of following Korn — something Bush regretted a few months earlier at Woodstock.

Richard Patrick and his newly-formed industrial outfit failed to catch the high energy already floating through the venue, even with the sure-fire momentum packed into the band’s new material.

“Welcome to the Fold” and “Hey Man Nice Shot” captured Patrick’s vocal prowess but were slowed down to levels that left rap rock fans staring at their Adidases.

If the former Nine Inch Nails sideman learned any “Family Values” Tuesday, it was to shed his industrial samplers for a pair of turntables.

And maybe a red cap.