This was discussed on 3zc. It doesn't turn me against Z1, I've had good experiences with them. Though I will say it would be nice if a little suggestive selling is used in pairing up throttle bodies with the gaskets... I assumed they were included ( I know I know) and when I opened up my box I was sad to see that I had order some. Maybe sell the tbodies with them included and make it an option to subtract them. Price adjusted of course.