Yeah it is pretty much going to ruin most any equipment that is left out there. 4 mods @ 100% come so easily it isn't even funny, getting the 5th mod tends to be tedious and sometimes impossible depending on how you make the weps but it shouldn't be hard to make a Balanced, Hit Spell, DI, SSI wep all at 100% intensity.
If you can work the DI onto your suit then it becomes even nastier as you could do a Balanced, Lightning, Velocity, SSI, all at 100% I have found that it might be better to avoid 100% intensity though as you will make putting the final mod on much easier if you tone down the other intensities when you can.