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Looking at the 2005 Online Order / Reference Guide it looks like the 3.42 is the only option for the ECSB Z71 with the L33 310 HP aluminum motor. Maybe I'm missing somthing? Does this mean a dealer can't special order. Would a dealer installed set of 3.73's void a warranty?

If this is true, what pro's and con's do you guys see 3.42's being on a lightly modified unit. Such as a tune with mildly increased exhaust and a K&N?
 

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GM says that 3.42's will offer same power with more fuel economy. I still don't understand why they didn't just make 3.42s standard and 3.73 and 4.10 options instead of 4.10 being only option.
 
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