Howdy , sounds like thats a drag car. I just want to run this one on the street. The 505 I have dynos at over 800hp 665 torque 14.6 compression. I've had it sitting here for several years,, now plans have changed and I'am going to turn it into a pump gas engine. The cam is pretty big 816 lift, ground to change the fireing order. I'll probly have big trouble?? I'll look into the mufflers you suggested. Thanks, TKH