This converter is super tight in town....I was really surprised. It drives almost exactly like my ST3500 in town. WOT is a whole new ballgame. On street tires, it spun them through 3rd gear like it was nothing. At 75 MPH, it flashes to about 4500 and pulls from there. Slowed down to ~45 and nailed it and it was at the top of 2nd almost immediately and catching 3rd. I love seeing that tach needle stay over 5K RPM's. It pulls substantially harder than my ST3500 did up top, and it was no slouch. I can't speak about the SS3600 since I've never had one, but I would HIGHLY recommend the SS4000 to anyone. It is not anywhere close to too much for the street.
Maybe I should have gone all out for the PT4400

. Seriously though, I am thrilled with this verter.