JHM longtube headers and STaSIS cat-back
The parts we were waiting on came back from the machine shop and we were able to complete the exhaust installation. The headers sound great with the cat-back; angry outside of the car while reasonable inside the cabin. The piping is 2.5" through and everything is connected with v-band clamps. You can click the video for a higher quality version.
STaSIS/Alcon brake systems
My brake system upgrade arrived at Achtuning today. I choose to go with the STaSIS/Alcon 370mm (14.5") 6 piston front kit and the 305mm (13.0") rear rotor upgrade. The kit includes rotors, pads, Motul 5.1 fluid and Goodridge stainless steel lines, and necessary hardware. I took the time to weigh the new brake system components: Front carrier - 1.4lbs Rear carrier - 0.6lbs Front Alcon rotors 14.5" - 14.5lbs B6 S4 OEM 12.25" - 26lbs Rear Alcon rotors 13.0" -13.3lbs OEM 10.0" - 9.4lbs Front Alcon 6 piston calipers: 7.8lbs
STaSIS 4:1 center differential
After a few weeks in the shop, we installed the STaSIS 4:1 center differential on my B6 S4. The stock differential provides 2:1 torque distribution, with the modified STaSIS unit we’re able to provide 4:1 just like the B7 RS4. I have not had a chance to take the car to an HPDE yet, but I have noticed an immediate difference coming out of the apex of a corner. Typically when you’re exiting, the car begins to under-steer; with the diff the moment you begin to under-steer the power is transferred from the front to the rear and we can neutralize some of this under-steer. There has been no odd behavior from ESP or ABS. The only thing I’ve noticed post-diff has been some Quattro binding at low speed turning, ...