Here's the gist:
Thread dig, but thought I would follow up on Sureflo. I bought one of their 3" systems for my SSV wagon. Short story, it didn't fit and every join had to be cut and re-worked. They reckon they trial fit every one to a car before shipping out, but this system needed 2" cut out of the length in the middle so I fail to see how it ever fitted. Fair enough it doesn't drone, but for all that effort it is very, very quiet. With their headers, cats and a VCM OTR and tune it makes 382 RWHP, so performance is okay.
Oh, and they fix the drone by using J pipes under the diff, so it sits heaps lower than any other system.
I couldn't help but point out that the hp seems a bit high with no other work, and figured he can mistakenly call helmholtz chamber J-pipes like yanks, although I agree the term is used for headers mainly.