All headers are pretty tough to install. If you don't have much experience working on a car or truck it's best just to pay a mechanic to put them on for you. I don't know what mods you have, but there are plenty of easier/ cheaper things you can do first for more power.

 

How much would it run to get new headers installed?

 

It depends on the shop you go to... Get a couple quotes and go from there... BTW the cheapest isn't always the best...
Pick on shop reputation and ask if they have done them before...

 

It isn't that difficult if you're fairly comfortable twistin wrenches. I put JBA shorties in my 03 Hemi in about 4 or 5 hours. Getting around the steering shaft wasn't fun but I later read that taking off the l/s inner fender wall and going from underneath would've made it much easier. You will still have to go to a shop to get the y-pipe welded, but you'll save some cash doing as much work as you can. The JBA's weren't cheap but were the only ones available at the time.
BTW I am not a mechanic.

 

Is there any major performance gains from headers on hemi trucks?

 

I'm wondering this also. I have always been told that dyno results have never shown a big inprovement on power numbers. I was just on the TTI website and they were showing something like 40hp improvement... however their baseline number was 165HP at the wheels for a hemi. This is hard to believe since most hemi base line at near 270-280hp (from what I've seen/read). If I could get 30HP improvement, I'd be willing to shell out the $800 for the TTI long tubes. This is all assuming I get it dyno tuned with my Diablo at a CMR dealer.

Any comments? I'd like to hear from anyone who has the TTI headers, and/or has dyno results from them.

 

so you have seen dyno results before and after? or was it from a web site that is claiming these numbers?

 

One of the magazines (I don't remember which one) was claiming over 300whp with headers and exhaust. It was supposed to be 30-40hp increase. Was that a hoax???

 

Pacesetter LTZs!

 

I went to JBA's website (cause that's what i've got) and checked out their dyno numbers.

Baseline: tq peak is: 304
hp peak is: 248

w/JBA headers:
tq peak is: 318
hp peak is: 263

tq gain: 14 lbs/foot
hp gain: 16 hp

Obviously this is at the rear wheels.