You must not know much about the delta. The top end of the Delta is weak as hell. That only really changes with either cams or a NGM stage 4 Intake Manifold setup or both.
I know the Delta isn't as strong of a block compared to the Beta, i test drove a stock 5spd Delta b4 and my Elantra with I/E feels much quicker......the stock delta feels slugish to me. I have a friend local who owns an 03GSR with stage 3 IM from NGM(upper/lower) and intake/exhaust, he beats the stock ss/sc cobalts but soon as that stage 2 and a proper cold air intake goes on the cobalt, he can no longer win. Whether anyone likes it or not, the proper mods on a Cobalt ss/sc makes for a very fast ride.......and believe it or not, when driven nicely it can get some good MPG, even with mods......the delta would NEVER get the kinda MPG the cobalt gets, and as for overall TOP performance, the cobalt ss/sc keeps up with the Tib sc from NGM. Take a look at cobaltss.net in the racing section and you will see their top 1/4 mile times are nearly exact to the Tib sc by NGM.
Top NT.com posted NGM S/C 1/4 time
"zeenon53" 2003 Tiburon V6 NGM S/C 12.55@116.25
Top cobaltss.net posted S/C 1/4 time
"DWK5150" 12.84@110.53
Both times so very close to each other and both are only using the stock s/c with supporting mods, no N02, no meth kits..........