Hey,
I think you have a bigger problem here.
The text at the bottom of every page is generated by template system dynamically replacing one variable only, thus resulting in very thin/dupe content. It's very probable that you've been hit with recent Google Panda updates.
Lexus body kits are add-ons and replacements that can be used to revise and revitalize a Lexus car’s outward appearance. After years of wear and tear, the Lexus exterior paneling on many Lexus cars begins to look old and, frankly, ugly. Any damage to a Lexus car’s paint job or to the Lexus exterior parts themselves can lower a Lexus vehicle’s resale value, making the use of Lexus bodykits just that much more important. ALexus bodykit can make a Lexus car appear newer, without ever changing any of the true mechanics of the vehicle.
Most aftermarket Lexus body kit upgrades come with replacements for several highly affected Lexus parts, Lexus bumpers and Lexus side skirts. These are the areas of a Lexus vehicle that are most typically damaged from regular driving, but they alone aren’t the only pieces that can be easily fixed. Other aftermarket Lexus body paneling can be used to customize a Lexus vehicle’s look, so Lexus body kits can sometimes be tailored to a driver’s specific needs. For an improved appearance that takes off the poor looks resulting from years of driving, a simple Lexus body kit can serve you well.
Lexus Cheap Body Kits Urethane Lexus Body Kits
etc
As a quick fix, you could try adding canonical tag from these sub cats into your main cat page but as long as you have this dynamic dupe content you're going to have a real problem. Open to hear others thoughts on this though.
I would certainly test this on one sub/main category before implementing across the whole site.
I would try to build out useful unique content around each body kit type (Urethane Body Kits, Cheap body kits, etc). This will give you less main categories to find useful content for, then mention the car makes and models within the content, such as suitable for: Lexus, Saab, etc.
Hope this helps
Woody 