More info on Ion Runner down at the bottom of the linked page.
When I joined Attention to Detail in 2002 they were developing a racing game for toy brick company Lego, to follow up Lego Racers 2, a PC and PS2 title which they'd recently finished. Drome Racers was known as Lego Racers 3 during development, and themed to tie in with some techie Lego cars.
I arrived too late to make a significant contribution to the PC or PS2 code, but got involved in the conversion to the Power PC based GameCube. Ports of the game for this machine and Xbox were scheduled to follow the PC and PS2 versions, and benefited from extra development time.
The sad thing about Drome Racers was that - due to publisher interference - it was a more playable game six months before completion than it was by the time Lego deemed it fit for release. The management of Lego games seldom lasted as long as it took to complete a console title, and drew from a pool of people with little experience of the games industry, which meant frustrating changes in direction that did not improve the eventual product.
Despite this, and the problems of the Kaboom group, the Xbox and Nintendo ports were finished on time, and the Gamecube version of Drome Racers briefly appeared in the UK top 10 for the platform.
A more ambitious project, Lego Racers 4, was canned after substantial development effort. This was technically interesting as the design called for streaming of the entire game world from DVD, allowing much larger and more intricate play area than earlier Lego games, or most console titles at the time. The team involved went on to work on Ion Runner, of which more later...
Also, I've never seen the Xbox version of Drome Racers in the wild... It's either really rare or actually never got released for some reason or another. I've only seen box art.
I'm gonna try to contact this guy and see if he has any more info.