[urr2slo]

A good set of headers would not only have fit without any problems but also would make more power. By "dimpling" the tube you are restricting your flow therefore losing power. For as much work as it is to install headers, and with all the info available on the forums why would you skimp on a set headers.
Not to bag on the op but with all the info out there, why do people continue to support these poor quality parts? Besides the obvious performance loss, think of the safety issue, these cars have soft mounts allowing the engine to move, steering shaft bind against the header can occur as the engine torques over, think of your safety and that of others.