I have macs and they are pretty good IMO. there are some better ones out there Im sure. When your ready I would be glad to install them for you for a fair price. You will need to sell the offroad H and buy a short H pipe with o2 extensionsDangerous Miguel said:Which longtube headers are the best and easiest to intall on a 02 GT with a mac o/r H-pipe? From the prices i've been quoted it's seem its no easy task!