We need 10 people to throw $200, and they will be done in 2 WEEKS!!!!

I kid, I kid.

I was curious what people are looking for in the way of headers. I am familiar with the past on this subject and have no intention of repeating it.

First of all, we will not be collecting deposits of any kind and are not predicting a completion date. The money to get started will come from us. Once the template for each is started they will be served up as needed. We will only vary on number of cylinders, not FI to NA and cylinders. That would be ridiculous lol. Plus the point of this thread is to make a great all-around set for everyone, not specific to one exact motor.

I guess the first question is, do the majority want long tube, or short tube? Log is out of the question since that is what we are trying to eliminate. Maybe both? Then I wanted to get people's opinions on primary diameter, primary length, collector diameter... With good data to back up why. Driveability, racing, mixed... Basically what range are we looking to beef up.

The Exhaust Valve diameter I pulled for my motor (online) was 12.7mm so .5 ". Believe it's the same for M112. The M112 port size is dead on 1.5". I could not find volumetric efficiency so my calc's were just 75% for that. I expect NA's to be less and SRT's to be more.

With that data 4-1, bore, stroke etc. The calc came up with 1.39" primary diameter, 34.2" primary length, 2.5" collector.

The problem I have with this calc, is it is contradicting to what everyone says works. Everyone says that the primary diameter should be the same as port diameter or slightly bigger. With that knowledge I am thinking 1.55" primary diameter with a shorter length. Opinions?

Unlike most that just give you headers, we are going to add anti-reversion tubing at the end, just after the collector (except on shorty's). This helps the motor not take in and mix exhaust gases that it already pushed out. On a seperate note, my welder and I are going to play around with adding those after the x-pipe when we build my exhaust as well.

As it stands the first 2 sets are V8 sets and are called for. However, since I still have my V6 in my garage it will be very easy to make a set a port short for the V6's since spacing is the same.

I have shown my welder pictures of sets for other cars and he is very displeased with most. "They look like crap" are his exact words lol. He said that most manufacturers are using templates, that ours would be one piece for the primary's and minimal visible welds. The more welds, the more pieced together joints, the rougher the flow.

I'm guessing drawbacks of headers might be a CEL you might get for no primary cats and misplaced 02 sensors. We are thinking of leaving my secondaries, and making plug extensions for the post-cat 02 sensors, so that they are still placed as before, after a cat. In theory, it shouldn't be able to tell any difference.

Like I said, post up opinions, idea's, theories, and if ya got nothing to contribute, at least say if you would be interested or not and what type of style.

No idea on pricing but maybe 800-1500 for shorty's and 2000-3000 for long tube. He is still deciding exact material but will be a 300 series stainless for durability, cost and retaining heat. The first NA and SRT set's would be sold quite a bit under cost to people with the intention of before and after dyno's. Those people will most likely be one of the more senior members (post wise) for credibility.