Re: 2003 H2 with 12" lift and 42s
No engine mods, so far, so good (except for the definite tranny leak, taking it back to the shop in the AM). Go for the 6". I ran mine for 7 years with a 6" and loved it. It's addicting tho....you'll want to go bigger after that. 
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2003 yellow Lux, 12" Bulletproof lift, 42" Pitbull Rockers, 20" Ultra Predators, Corsa sport exhaust, painted interior
2004 Cadillac Escalade, white diamond, dual tip chrome exhaust, 20" chrome 9-spoke rims, altezzas - TOTALLED!!!! Replaced with a nondescript 2009 Chevy Tahoe
1970 VW Karmann Ghia, black with a flame job and too many mods to list
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