Hi there, I couldn't afford the Stivo either so I've got an 05 Ascent Sport. As far as mods, yeah you can go the CAI, and cat-back exhaust, new springs, wheels etc etc. If you want some inexpensive minor mods to start with, read up on some of Danz posts regarding grounding wires and a throttle body coolant bypass, which I have not yet tried but it has definately got my interests piqued. Regarding your question about the difference in engines, the Stivo has a completely different engine to the standard rolla. It's a VVTL-i engine, the 2ZZ-GE as opposed the standard VVT-i 1ZZ-FE Corolla engine. I'll let the Stivo owners explain the Lift capabilities of their engine, but know that it is the same engine as found in the Celica, so you know it's a different beast all together. I'm interested to see what else comes out in this thread as I'm looking for mods to start on my car.