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I tried just a sport cat on my cab and found it too loud. I would imagine that a primary or secondary bypass would have a similar sound.
The sound was nice, but it begins to turn a refined street car into a track car. The stock exhaust is perfect in my opinion. I like being able to hear the motor working hard at rpm rather than the exhaust.
I'm happy with the primary bypass, but I "feel" that there is less backpressure than I expected. It almost feels like there is less torque although this is actually not the case. I'm now accustomed to the sound and characteristics and am happy with the result.
PM me if you wnat something different. It's a Shubert made for DP. There are pics around in earlier posts. I think you could run this and a G-Pipe without being too loud and obnoxious while saving 30 or more pounds. $250 plus S&H. IIRC, I paid $400 when I got it.
OK, I installed it the other night. I really like it. There is a definite difference in the exhaust note. Not sure if I can feel the supposed 8HP gain.