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if you add a exhaust cam with the intake cam, you should see another say 8 or 9 wheel horsepower gain, possibly 12 if other mods are already providing power gains. all together anywhere from 13-25 horsepower just out of cams total provided other mods ( say c.a.i., exhaust work, etc.) as far as duration and lift...that depends on application and your desire. you dont like the loud cam sound, so you wouldnt want a super high lift, so maybe a slightly longer duration with smaller lift...if you plan on going turbo, higher lift and shorter duration. this should also make the exhaust note a bit healthier at higher rpms, and torque will jump drastically. hope i was of help.
jeremy
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