just curious what double diamond subframes are, are they the ones that connect front to rear and at the tunnel crossbrace?

 

Yes, generally. I think originally Kenny Brown came out with them as the name of the product (Kenny Brown Double Diamond Subframe Connectors), but other vendors probably have made the term more generic to the style you describe.

Dave

 

Just curious because the double diamond style seems to be better for road racing/autocrossing and I was wondering if thats what i have, I got the boxed steel BMRs that connect front to rear and at the driveshaft tunnel brace...