It's a grey area at best. Technically, I shouldn't be running a domain with 'honda' in it at all. They actually went after a few domains back in the day (circa 2003) but nothing panned out and they dropped it.
Honda-tech is owned by IB, a multi-million dollar company with an entire legal team, etc.
Hondaswap is owned by me, and me alone. If honda goes after me, i'm done in all sense of the word. I can't afford a lawyer's services for a day, let alone a long strewed out battle.
So, that came back to NOT using 'hondaswap.com' on the shirts, which eventually defeated the purpose of the shirts in the first place.
I have no legal trademark on the word hondaswap.com as it cannot be trademarked due to honda banning all 'honda-like' words in their trademark. I have proof of ownership through whois only. And even there, you're going to see my proxy service.
Not to push the arguement or you but:
What is the difference between Hondaswap and Honda-Tech in the eyes of Honda Motor Corp? You are small time and not hurting them at all.
How can a company ban anyone using two words put together? Especially since you are not trying to confuse a market base by using that H word. That is the legal basis of trademark infringement. www.hondashowoff.com is selling items with their domain name on it with no worries and they are smaller time than you are.