For those who said i defenitly need heeders with 3.4" i readed on ZZP this following statement : "The 3.4 will give ~25 additional HP. Supporting mods that are required include colder Tstat, stage 1 throttle body, colder spark plugs, cold air intake, TB spacer, we recommend at minimum installing the Ubend delete, but the best exhaust mod is our downpipe." They never say we need headers but i understand it's better with headers. But i got better then the minimum they recommend. with my set up. I'll change all my spark plug soon n i'll take some pics. Cross fingers i didn't chip piston... Btw thanks for all your advice !
