Nicolas,
I shared Countryboy's observation regarding your web site. I can understand your reasons for not listing prices but what would be really nice is if you had a section that listed the complete kit contents, along with pictures of the kit as delivered, out of the box.

It took me 15 minutes of reading bits and pieces of information in various places to try to figure out how complete your complete kit really is and whether or not it includes a tailpipe. Likewise it would nice if you had a section with a consolidated list of all the accessories you offer.

Just a suggestion.

Joe