No, you're right, thy're for a BBC. They have separate collectors, so finagling the pipes to match up to the ports on another engine wouldn't be too tough.
Has anyone ever seen the Winnebago Man blooper footage on You Tube? That's pretty much me at the bench! Screaming, cursing, muttering under my breath, wild gesticulation, the whole deal.
EJ's is also worth checking out (is he still around?), but Ryder's is the main shop in town. Just beware- heavy traffic, and lots of idiot motorists in that city.
Most of you police car guys probably know this, but in case you didn't- the AMT Rides Magazine kits (the ones with the GIGANTIC wheels) come with a laptop computer as an accessory, along with a PS2 and controller. Not that you'd need those last two in a cop car, but still!