I am building my first road race car. Tired of Spec Miata (sold!)

I have been told by my engine builder that this thing in the exhaust port is part of the "smog system" and can legally be removed.
I know that Mazdatrix in Cali says not to remove, buy my guy says I need to spend the money to remove it, and it is illegal to use the Turbo housings. It sounds legit to me.
Opinions??



If that pic doesn't show up, click here:

http://www.mazdatrix.com/faqpics/porting/6pexh1.jpg

If that doesn't work, cut and paste this into your browser window.

http://www.mazdatrix.com/faq/6pexh.htm

thanks, Donny F