I can recommend these companies because I have had friends and old customers with work done by them. Start with the list and do some research on them.

* Port Flow
310-257-0351
http://www.portflow.com/

* ENDYN
817-924-9334
http://www.theoldone.com/

* RLZ Engineering
806-372-3779
http://www.hondaraceengines.com/

* Alaniz
310-808-9704
http://www.alaniztechnologies.com/