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Originally Posted by WE3RX7
I guess I'm slightly confused on the welding though - did you cut it apart to smooth out the interior and then weld it all together again? What are your thoughts on the gains that would make?
I dont plan to go to that extreme on my RE but power output should still easily make 425whp...
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Your right...The manifold had several areas cut out to smoothen the interior and decrease air turbulance that could potential disrupt the smooth air flow that were aiming for. Also cuts allowed access where the dremel couldn't reach through the main opening. My fabricator also widened the degree of curvature in the primary runners to smoothen the air flow. If you look into your manifold,in some area, there are large bumps (thick areas of the manifold) those areas were also ground down. Over here at the shop my fabricator has done it to an FD manifold. I believe it's an awesome modification though it required a ton of work, it has been already tested on a 13B-REW. At first the FD has a T78 turbo, streetport and stock UIM and LIM it put down 311rwhp @ 11psi on a dynojet. After being port matched and having what was done similar to my UIM, the FD was redynoed to 342rwhp at 11psi.
That's awesome that your setup will be in the 400's, I'm hoping to be in that power range with my setup.