would you accept that kind of step in a exhaustport? i wouldnt.
the point with an X-pipe is to keep velocity high enough to help pull the next pulse coming in the other pipe thru the exhaust that big box wont do that and those steps will create turbulence.
will it restrict power in any noticeable way on most streetcars? probably not a big isue.
is it the best way of doing it? i can guarante its not.
is it good enough? thats your choice,but when you are building a performanceexhaust why would you settle for something that is worse than it has to be?
some would say oh well that thing will be good enough since its not a racecar, i would say think a few steps further and try to use the best workign pieces the whole way and the car will run stronger and be alot more fun without spending more money.