[batboy]

Howdy, I'm one of the guys from the LS1GTO forum. I tried to talk my wife into getting a Catera last month when she was looking, but she bought a Mitsubishi instead (women, sheesh).

I have a 04 GTO that I upgraded to larger 05 brakes. That means I have extra 04 GTO parts laying around gathering dust. My wife would like to see them gone. I changed brakes at around 10k miles, so they are in excellent condition. I have pics if anyone is interested.

I saw some discussion about whether 16" wheels will fit over 04 calipers. I have no personal experience, but I've seen others on my forum use 16" wheels. The 05/06 GTO calipers are bigger and a 16" wheel definitely don't fit over the bigger brakes. Now I don't know if Catera 16" wheels have less offset or are thicker than what others used. The standard wheel on a 04 GTO is indeed 17", so to be perfectly safe, that might be your best course of action if you do upgrade.

I've also heard the rear shocks and coil springs from the GTO will fit on the Catera. These supposedly are much better than the stock stuff. I also have those too, since I've also upgrade my suspension.

Glad to see folks over here are doing some mods to make their Cateras more sporty. The GTO and Catera are distance cousins and you might find other stuff that will interchange. Good luck.