Loss of backpressure can (and often does) result in loss of LOW END torque.
The delta 40s are very high flow, and while they will let your engine breate really well as the RPMs get up there, they may make it "seem" to bog at the start.
This problem is more typically seen with trucks when the owner figures they will be cool and swap over to 4" exhaust, and all of a sudden towing power is gone.
I wouldn't worry about it, as the mods increase, you will utilize that higher flowing exhaust, and will cease to notice the "lull" in the launch.
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