How do you guys feel about the LT4 km likes or dislikes with headers and roller rockers? Any body had any gains ? I did a search and came up with mixed results Also i am spraying a 150 nx wet kit ...

 

You have to judge for yourself on your car. The only reason to put one on is if you have verifiable spark retard due to false knock. You can only prove that by monitoring with a scanner or a logged run with diagnostic/scanning software.