X2. Call them on their 800 number and ask for Paul. Paul at one time owned a high performance engine shop and was a crew chief on a pro mod car. He knows his performance stuff. The owner runs a BA/A Pontiac with a Pro-Stock motor mated to a 904. A no BS company and are one of the very few that have warranties on all converters.
As others have said, don't let price be your guide to buying a converter, as you only get what you pay for.