As the title states, which would be better for a DD? I'm not concerned with vibrations or cabin noise, but I would like to stiffen up the engine movement a bit.

As much as I would like to do the entire mount set, I read on other forums of the oil pan mount breaking in rare cases with the Boombas. I'm not terribly worried about it but if I can get the (near) same results for a fraction of the cost and peace of mind then I'd rather go with that option.

Anyone tried both on their Si? Which do you prefer, or was there any noticable difference between the two?

 

I can't say I used the Power Stick but I did have the Stiffy in my car. I then put the Boombas in once I put the blower on and the mounts are amazing! They vibrated like hell at first but after a month or so they vibrate much less and now you can barely notice at all. I love em!

 

I'd say just inject your OEM mounts with Windo-Weld or equivalent polyurethane/epoxy.

If you're really set on spending more money, go with the Boomba's.