What brands of shorties bolt to a stock 94-95 y-pipe?

most come with their own y-pipe- is that because they wont fit the stock one?

correct....and it should bolt right up (or weld) to the stock cat...

they are a better design than the 96-97 dual cat headers since they can re-route the primaries slightly for better flow...since there is more room due to the cat not being bolted to the manifold like the dual cat versions.