This is all subjective to ones perspective and opinion of what a "punch" is and they find to be ample bass for a stereo.
I will admit the H3s sub system is one of the most impressive for a "stock" car. However, if you would turn up the radio on a really good song you will notice it doesnt perform like an aftermarket sub would perform. The bass gets pretty distorted at high volumes so you have to crank the bass down so it sounds "good" (to me) and now you are getting no more bass out of the sub than what you are getting out of the door and rear speakers hence defeating the whole purpose of having the sub in there.
Now, if you were to put in 1 or 2 nicely installed JL 10s with a JL 500/1 mono amp you can turn the amp up to about 1/2 and the gains down on the head unit and you will hear a REALLY nice clean bass sound that yes is "louder" than the stock sub but not over bearing to take the windows out. Also, if you decide to turn up that favorite song while on the road to enjoy it you will have a REALLY nice loud non-distorted bass sound to go with your realy nice sounding stock system. Once you hear it you will totally understand what I am saying and would never question "why do it" again.
And, if you wanted to (and I rarely do) you do have the option to crank up the gain on the head unit and really cause some vibration =)
<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by jkH1+H2=H3:
This maybe another stupid question, Why do you need after market woofers/speakers, the H3 delivers a great punch,,
I guess I am not interested in blowing out my Ears, or driving up and down the street going bomp, bomp.bomp, Bomp, Bomp..Bomp </div></BLOCKQUOTE>