Thoughts on Fast Intentions exhaust vs Stillen exhaust. The rear section of the Stillen is twice the weight and more difficult to instal. I like the mesh visible inside the Fast Intention ports and visible cans, my wife likes the Stillen look better. Cold start the Stillen is surprisingly louder. At half to full throttle the Fast Intentions sound is more crisp and exotic, like the difference between listening to someone speaking directly to the phone compared to Bluetooth. The reason I bought the Fast Intentions was I thought it was the best sounding exhaust. I have high flow cats that make it as loud as the resonated test pipes it used to have. The Z1 Ultimate rear differential changed the gearing to 4.09 stock is I think 3.78, it is in the higher rpm a lot more now, 3rd gear feels like 2nd used to. At cruising speeds the drone became much more noticeable with the new diff. The Stillen cured this as the sound is much more muted under load at cruising speed and I can hear my new high end stereo without cranking it up. If I had not bought the Berk’s and the diff I would have kept the FI.
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