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Since mine were going to be removable for the Exhaust Shootout I welded them to a base plate with a bolt for attachment but you would weld it straight onto the pipe. These were made with 18-gauge tubing but I would suggest 16 gauges. Once you have the patterns you can use the same paper pattern technique as I used for the How-To Super Port J-Pipes to transfer the patterns to the metal pieces.
![](http://img.photobucket.com/albums/v668/dvdt/Exhaust/MySpike6.jpg)
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![](http://img.photobucket.com/albums/v668/dvdt/Exhaust/MySpike13.jpg)
Here is a pic after the dyno runs. You can see the tack welds at the corners for the temporary installation. For a permanent installation they should be completely welded up at the seams and smoothed out.
![](http://img.photobucket.com/albums/v668/dvdt/Exhaust/Shootout5.jpg)
Cheers, Rod
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