First off you can not compare a Viper or any other motor than the 4.6 that is what I'm talking about here. I'm commenting on the HCI intake for the Cobra I have no experience and frankly don't care about Viper or any other cars motor.
One of the first production HCI intakes that made was put on a NA 4v car to prove their results and the car lost tons of torque below 4K RPM and at one point it was near 50 Ft Lb Tq and gained about 20RWHP. That was after 5-6 hours of tuning as well. The post was on the Corral but is over a year old and I'm not about to search through their achives (if it wasn't lost) to find it. Blower cars are a different story but short runner intakes are designed for FI (forced induction) cars and don't work well on NA cars. They are made for high RPM racing applications not your average street cars.
Also if you want to be picky about wording your the one that stated:
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HCI in Sacramento Ca. have designed a new intake manifold for the GT's and Cobra's
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Insinuating that there is one new intake to fit both Cobra's and GT's which isn't possible. That is why I said there was a difference because there was and your statement was misleading. Just like your statement of picking up 60RWHP with a blown Cobra like anyone with an S trim would do this. When in fact they won't, without knowing the entire set up on the motor plus I've love to see that dyno chart before and after to see the different in torque since that changes drastically with a short runner intake.
Bill