Is it possible with both on a 91RS, have 434SB just done need good exhaust and i don't know, but i wouldn't think a catback could cut it, heads are being done to flow pretty d*** good, figure do what i can while still out

 

do a search on X-pipe and you will get ALL the info that you desire (including pics)... It CAN be done... BUT, you will have clearance problems... and you would have to get it done CUSTOM... because there is NO room under the car for a crossover.. (you'll have about (1-1/2) - 3 inches of clearance... where the X would be is directly under the tranny (which is the lowest hanging part of the car)

 

Contact Dr.Gas They can bend you up some oval tube and x pipe. Its spendy but Hey you dishe dout $$ for a 434 you can swing a little more and hav eit done right.

Im doing my Hooker Supercomps. into a X pipe all in oval tube from Dr.Gas. into spintech muffs