Not too bad start but a few words of constructive critisism.
1) Maybe get yourself a logo. Text that large that is live text looks jaggy.
2) The photos are jaggy or aliased as was said. It looks as though they were resized as gifs or resized on the page.
3) Maybe get some style sheets going on the page for text, perhaps make some rollovers for the left menu text and consider left or right aligning it instead of centering. Centering tends to be harder to read.
4) The photos, most of them seem similar in size but a few are off either way too big or small. Consider keeping them around the same size and possibly laying them out different on the page, the large gap to the right on each page looks a bit awkward. Also since you are showing your stuff and maybe even trying to sell stuff might be good to have larger pics either popup or populate the page or something when you click on a smaller one so people can see the detail in your work.
One of my team mates who is well known in the nissan community is sporting many custom items for him that I have mead including the eyebrows, diamond plate splitters, Sail speaker pods, and LED tails.
yo mike. you should link to bigger pictures.
i wanna see more details. some of those pics are TOO small :O
eeee.... my car made it on your site! im soooo proud!
on a side note: i didn't know you made sideskirts too! i might have to drive over there next summer and brainstorm some new ideas to tie in with the GTR front and rear.