Pick up an Amsoil dealership so you can sell their EA (rebadged Donaldson) filtration products. I wouldn't push the Amsoil lubrication products as I believe that a number of their products are more snake oil than anything.
http://www.amsoil.com/filtration/index.aspx
Add Adel Wiggins to your list of available product lines.
Add a gallery to your website.
Put together a line of stainless downpipes which are a 2.5"-->3" transition. I'll be the first in line for a 1G AWD model.
If you have a weak point, don't pretend that it doesn't exist. Be 100% up front with people.
Don't turn into another Slowboy Racing.
Don't try to reinvent the wheel with everything you do. There are too many shops which pretend to do this and they only make themselves look like immature fools because of their true lack of long-term experience like that had by Buschur, Marco, Shepherd, Brown, etc. There is a difference between reinventing the wheel and ingenuity. Don't market yourselves as experts because you may have won X award or received Y certification.
Prove to us (the members) why we should give you business. Obviously you have the Toonerz crowd on your side by the discounts you're offering them but there are many people like me who look beyond the price.