http://store.summitracing.com/partde...5&autoview=sku

they look awfully familiar to what eric bazan used on his s400 build, not entirely sure. but they look like they may fit and would be a good start, however they are a bit $$

 

looks like they are the exact ones, just talked to him as well he is making 750rwhp using these as well....

 

I think its a move in the right direction,,, but not sure yet.

It does look a little home made for the the price - Compare this to the obx stainless shorties for similar price

The bends on the 2.5" look crush not mandrel - WTH is up with that?

So for $300 from summit I need:
$50ish for my flanges from the guy on ebay I like
$15ish for 2 45^ 2.5" pipes
$50ish for enough 1 5/8" bends to do the primaries.
-Welder time and supplies - I think I will keep building my own.

 

Those are pretty good... I prefer 1.75" primaries on my logs, and those flanges are only 5/16" thick...