I have one in my 99 4x4 tahoe and it runs great, but it's lacking the power of the 5.3 and 6.0.

I was thinking some shorty headers, roller rockers, and cam may help liven it up , but other than that i like em.

They seem to be good performers , but they do need lots of mods to keep up with the 5.3L

Someday i'll switch mine out with a 6L and 4L80E, i can't wait to start that project, it's just a matter of getting the wifey another vehicle and talking her into it. hehehe

what did you have in mind?