wat exhaust?

i have seen a lot i have read a lot about different ones, but it all comes down to most hp and best sound. I have a 1990 civic si, and i was wonder exhaust system do u guys like. I dont want side mounted i think thats the only thing i hate...I have seen apexi ,hks, rs*r , tanabe, and 5zigen didnt make anymore :\... thanks for the help

Go to your local muffler shop and ask for a fart can. They'll give you the right one.

On a more serious, different brands are not going to have a lot of power difference between them. Get the cheapest one.