I have seen a set of Gibson headers advertised for 2003, 2004 Hemi Ram pickups. Does anybody have these and what kind of gains did you notice with them. I am running a dual magnaflow already so how much power would you expect to gain from a set of headers?

 

Honestly....probably not that much without the addtion of a new Y-pipe with high flow cat.

Gibson is so/ so quality...but for a comparable price.

I have ordered a set of Kooks Custom Headers/ Y-pipe for my 05 Hemi and they have Dyno tested it to gains of 18hp / 25 tq at the wheel at peak levels....the Y-pipe with a new high flow cat is really what will make the big difference...headers without a new Y-pipe is kinda pointless.....you have nice flow in the beginning and end (if you have a catback) but its like a SQUEEZE in the middle of the system with the stock Y-pipe.

 

Unless you are interested in top end, get the headers with the longest primary tubes you can find (and no less than 3/8" thick flanges at the heads).

All the best.