Meh, dont stress too much if you have a bellmouth dump pipe...its not as if your going to make an extra 50HP by having a splitter in the dump pipe!!

but the thing is i went from a splitter to a bellmouth :P

HKS downpipe looks like a bellmouth... thing is you guys are sayin the splitters are better where HKS zorsts are worth well over $1500 buks.. hmm makes no sense dont ya get what ya pay for?

I have a HKS down pipe on my car. (only found out the other day )
It's different to the typical bell mouth, take a look at the pic below.

http://www.hksusa.com/images_products/2618.jpg

Not sure if this is a good or bad design? Being HKS im sure it wasn't cheap, has a nice lable on it thought, "Only for off road".