We have spent countless hours in making our long tube headers for the nissan titan. They were originally a copy of the discontinued Nismo headers but after further examination, we feel that there were improvements that can performed on them. There were four things that we made improvements on. below are the list.
- 1.) we noticed the “equal length” wasn’t exactly equal length on the original Nismo Headers. Both runner 3 and 4 on each side were approximately 2.5″ shorter than the rest of them. We decided to modified the runner length and extend them so that they are more equal length.
- 2.) we improved on was the merge collectors, Nismo use 2.25″ O.D. We feel that we can gain more hp by increasing the merge collectors to 2.5″ O.D.
- 3.) We feel that we can help with exhaust velocity by using a thicker gauge material tubing. Nismo use 16Ga tubing, We decided to use 14Ga to help retain heat and allow greater exit velocity.
- 4.) Nismo use 409 Stainless steel on their headers, We feel that although it is acceptable, We want a more quality material so we choose 304L Stainless Steel.
Below are some pictures of the finished product
Dyno chart of a stock tune dyno pull (blue) vs. Uprev tune stock header pull (green) vs. Longtube Header with Uprev tune pull (red). You can see that we gained close to 50rwhp over stock tune and 33rwhp over stock header Uprev Tune. All these pulls were done using 87 octane fuel.
Here’s a dyno chart showing what the truck should be doing when we replaced 87 octane with 93 octane. Noticed that we picked up an additional of 7rwhp and 18rwtq
Above is a picture of the collector we made for the headers. they are angled at 18 degrees.
another picture of the collector welded together.
Inside of the collector
Pieces we cut the make the collector
two pieces put together to make the merge.
Finally for those that doubt what these headers make since we do all our testing on a mustang dyno. Here’s a dyno chart measurement using a dynojet. Some skeptics doesn’t believed that the mustang dyno measured approximately 10% lower than a dynojet. Here’s a proof that it is right at 10% difference.