I vote for Vararam- I don't own one but many members here on C5 who's opinions I respect swear by their's, and I've been won over by their intensity of support.
Pair it with the Mace 25mm. I do own one of these and it has a larger impact on performance in the midrange RPM, which is where we normally operate a street driven car. It makes a 3.6 L engine feel BIGGER.
Vararam for top end response and Mace to cover the middle.
