I answered these questions so often that I finally wrote a paper on the subject. Please read and then ask your specific questions:

http://streetmachinesoftablerock.com....php?p=764#764

Here's some more stuff on re-locating the battery and wiring, etc. It is included in an interview I did with a former member on this board named Streets. It might help you to read the whole thing to get some input on the mindset of technical inspectors at the drag strip.....

http://www.streetmachinesoftablerock...opic.php?t=174

No matter whose tubing you buy, mic every piece before you ever fire up the welder. De-burr the ends and measure the thickness very carefully.