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The quiet baffles will deepen the tone and give a much better sound.
I have had these pipes and i believe they sound crappy without the quiet baffles...which are not really quiet, they just bring the tone down where it sounds better.
Same deal with the striaght shots. The quiet baffles deepen (improve the sound quality) but don't really make it quieter. Experiment with packing if you want to fine-tune your sound. The popping on decel is probably an air/fuel management issue.
Had an email discuss with both and both say the quiet baffle they make will knock 9-10% off the volume and will give them the deep sound you want.
V and H quiet baffles do f/a for noise...about 3 db if u r lucky.