Thanks for the suggestions... I have added a select for the manufacturer (top right), not sure how to deal with the plentiful results per manufacturer though - I think me best bet is to encourage the use of the search function, which should make narrowing things down a lot easier. I'll work on that rather than trying to make a complicated select widget for the manufacturer page.
To briefly respond to the other posts, yes, most specifications are directly from the manufacturers. No user-submitted specs are accepted (anecdotal top speeds, for instance).
Most often, trim levels are omitted. This is because a manufacturer will offer various trim levels with identical technical stats. I don't have time enough to get all unque models in, let alone 3 or 4 variants of exactly the same data. Future plans include adding aliases so that I can duplicate just the model name.
And lastly, if those who struggled to find their cars could please briefly mention what cars they are, I'll either add them if they're not there, or point you to their page if they are already in the database.
Thanks all for the interest, and if I can help in any way, please just shout...
Cheers
Zak