Get an accountant. I use united tax and accounting @ 7311 East Main Street in Reynoldsburg (614) 863-4135 Dan owns the place and does all the accounting for small business clients.
An accountant will make or break a small business.
Lexus and the VAG has huge issues with it. Lexus performs services for it with oil changes. I'll be curious to see how the domestics deal with it, from some people I know up in Detroit they had the same exact issues with the Fords.
Intake valves. It's a pretty serious issue. Normally the fuel being sprayed does a great job of keeping the intake port and valve clean. On a DI car that doesnt happen and they have some pretty serious carbon issues in the intake port and on the intake valve from the PCV system and reversion.
We will work on something eventually. We have an Amazon and Ebay store but we don't sell much of the product we have in the store on there (though we have over 1000 feedback on both sites) we opened the store to sell the larger products we get that are tough to ship. Our products change all of the time so it would take a large amount of time to keep it up to date and I'm not sure it would be worth the endless hours. I will post up some pictures of the store this week to give you an idea of what it is and what we have.
I doubt we will have an inventory list on the website. We have a warehouse of stuff and it would take a very large amount of time to do that, we are always getting in new product as well.