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to run the car with both a 3" exhaust and then with a 2.5" exhaust, same day, same dyno sort of thing. As for the dual intake, in the vehicles I have done a JWT vs. XStream (or my DOOLZ that Z1 sells), it has shown to have greater benefits with my design, and not just power-wise either. The improvement is clearly shown in the dynochart you are referring to with the three runs on it. The lower torque/HP curve was the JWT, and the two higher TQ/HP curves were with my Xstream intake. The higher (red lines) was the XStream with the bias plates adjusted to bring the A/F mixture up to 12:1 from 11.5:1. It made more power through the entire RPM band, not just on the upslope. 
[ ashspecz.com ]
[ agpowers@bellsouth.net ] Enthusiasts soon understand each other. --W. Irving.
Are you an enthusiast? If you are out to describe the truth, leave elegance to the tailor.
Albert Einstein
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Yes, we would definately need a dyno comparison session - 
