Ha ha ha ha, a Nissan 300zx twin turbo, my dream ride! but since starting a family I just have not been able to swing the money to get one. Theres always something else in the way to gobble up my cash.
Question number two, do a google search and you will see "sports cars" results in a feww hundred million results.
From the looks of your blog you have about 13 posts which is shit for being live for 2 1/2 months. you really need more content! and you also need to make sure you have a decent ping list set up. you need to get hundreds, thousands of posts. If you are serious about that site, set aside a few days to set your blog to post daily using AP timestamp, then once you have your blog auto updating with a few posts daily you can concentrate on dropping links, writting and submitting articles and other important functions.
If you do the above I can garuntee you that your site will see a major jump in traffic as well as placement.
So;;;;;
Set your blog up with enough content to update daily with idealy a few posts per day for a few months or at least a few weeks, to free up time to promote by dropping links, submitting articles and participating on other forums related to your niche, also submit to directories.
You can take things a step further and do keyword research for your posts and using highly targeted and well searched keywords in the titles of your posts and within the posts themselves.
Also nonce you start building content you are going to want to come up with a linking stradegy from page to page, post to post, page to post and what not, this is very important, inter linking is very important, but even more important is getting one way links.
So content then get out there and get some links, the search volume is there even though the niche is a bit over saturated it makes no difference, if you SEO right and get incoming links you will see traffic, you may not make it to number one for Sports Cars, but I garuntee youll see a jump in traffic.
Your site right now will never see more than a few uniques per day depending on natural traffic, you reall need to focus on, on site SEO, gaining links and content.