Heh heh. The research I did tells me they're made by a place called TriMil Industries here in the LBC on Paramount. Check this link (ironically the business search service is also called "Manta" - how totally cosmic, dude).
http://www.manta.com/coms2/dnbcompany_hxzzc6
I want something that'll sound. . . well. . . "uncivilized". You know. Like a 911 should sound.
I'm not concerned about a horsepower or two - this isn't a track car or a uber-performance project where I'm counting 1/100ths of a HP and ounces of weight. It's a mid 70s restoration project that's supposed to look like a 70s Porsche.
My stock muffler sounds pretty good but is rusty, so it has to go. I won't tolerate rust in any form as I continue to restore this thing. A Dansk with trumpets might be kinda' b1tchin' too I'm thinking, but the Manta caught my eye just because it looks like it'd be. . . fun. And raw. And really, really loud if I want it to be.
I have to admit though, it doesn't really look all that engineered. Someone just got some pipes and run-of-the-mill mufflers, did some cutting, pipe bending and welding and that's what you get as an end-product. I imagine they sound pretty cool though.
Maybe get 'em and slap them on just to see? Whaddya' think?
Or should I just get a Dansk with trumpets aimed at face level of SUVs following entrail.