I have an L33 5.3 (see sig) and the entire performance of the truck has drastically changed with just the mods I have. The 4.10's of course, other than the tune, are huge. Had an ARE Stg 3 head/cams pkg with 4.10's (6spd) in my '00 SS Camaro... this is basically the same engine minus 21 cu in.

As per above regarding the shorties... If I had to do it again, I'd forget the shorties as they showed basically very little gain (they look pretty&#33 and I'd do the tuned long tubes instead. At the time I was considering going with an STS turbo so longtubes didn't really factor in, but now that I've decided against that, the longtubes are probably something I'm going to do next year. If I added a cam, I'd personally not do it without serious headwork, but not so much as to severely kill torque on this little motor.

I kind of altered my thinking in making this utility vehicle into some semi-drag one... man, 5,000+lb is just a lot to get movin'! I also want a good tow vehicle so I'm staying conservative.

Now an STS on the 3.5L Canyon/Colorado is much more interesting since I heard preliminary results on that. Want to go downsized in future vehicles.