I have a 73 chevy nova with a 350 from a 69 camaro. 2.02 ported polished heads, hooker comp headers, bored .3 over, Mild Comp Cam .49 lift. I currently have a flowmaster force 2 system on it that includes the Cross flow muffler. I cant find any cfm stats for the cross flow and I wanted to know if there is a better muffler to use the car. I have a pair of new dynomax rh super turbo mufflers in the garage a friend gave to me so I was also wondering how those stacked up flowing at 410 cfm each. Any help or comments would be great, thanks.