Smokn '94 Z

Have any of you guys running this set up have any fitment issues or banging issues? My friend & I are trying to get this set up installed properly on his '98 LS1 Z28. Anyway we have it all together but the mufflex y pipe is basically up against the bottom of the frame on the drivers side which will cause banging issues under load. Also where the Y comes together in the 4" collecter, it seems to be to big. We cant fit the tunnel brace back on "Properly". Anything you guys can think of that we might be doing wrong, please let me know.

Thanks