I was wondering if instead of 2 1/2" pipes for a dual setup, using something flatter and wider to run underneath the chassis for better clearance. In other words, rectangular instead of round. I was thinking that a 2"x6" rectangular shape would flow at least as much as 2 1/2" round pipe.

never heard of something like that, sounds neat tho

For ground clearance, I've always seen oval pipes used.....
http://www.boyceindustries.com/boyce-racing-index.html

yep. works great

http://drgas.mybisi.com/products/Ova..._194998/?page1

TPI Do you have any pictures of the rectangular exhaust installed?

No , I dont have it on this car. Im thinking about doing it with a side exit again but Im not sure yet,

His link is to oval pipes like what I showed, not rectangular.....Rectangular wouldn't flow very well, because of the inside corners.

SpinTech still makes ovals too. Since reading this,I had NO idea there were more makers of the ovals!!

Yea I saw his link, but he did not refer to rectangular or oval pipes when he answered yea works well.

Any pics of them installed?

Tony.

I saw some flat ducting on a BBC powered Saab 900 in the UK a few years ago. It was one of the quickest street legal cars in Europe at the time.

You mean like this? This stuff is all hand made and takes a rediculous amount of time/labour to fab. The Dr.Gas stuff is very expensive and running oval piping does present a certain amount of packaging challenges. I think your better off running one of the large mufflex systems.