2008 Viper SRT10: 603 rw hp & 571 rw torque

[John Hennessey]

Hennessey stainless steel long tube 1 7/8 headers, 3 inch exhaust, no cats bolted to a stock Gen 4 engine. The headers gained about 18 peak horsepower at the rear wheels. Even more impressive was the mid range rear wheel hp and torque improved by about 25.

More details coming soon. Yes we have a video and the beast sounds like a beast.

PS - thanks to my guys in the shop for getting a lot of testing done on the 2008 in a short amount of time.

[John Hennessey]

By the way, we have gained 57 rear wheel hp and 56 rear wheel torque over the already impressive stock numbers of 546 / 515.

[Joelcool]

Sweet! I can't wait to see what kind of numbers you will be able to put down in the 1/4 and the mile!

[Kevin D]

Originally Posted by John Hennessey

By the way, we have gained 57 rear wheel hp and 56 rear wheel torque over the already impressive stock numbers of 546 / 515.

John, was the 603rwhp / 571rwt SAE corrected or the raw uncorrected numbers? What kind of dyno? Is it possible for you to scan the dyno sheet.....great job being the first one's to develop an exhaust for these new motors*

[John Hennessey]

Originally Posted by Kevin D

John, was the 603rwhp / 571rwt SAE corrected or the raw uncorrected numbers? What kind of dyno? Is it possible for you to scan the dyno sheet.....great job being the first one's to develop an exhaust for these new motors*

sae corrected. we have since gotten a bit more power. this car continues to impress.

[King_Sadi]

I've said it before and I'll say it again; god bless John Hennessey. This is great news for Viper fans.

[C.W.A]

Originally Posted by John Hennessey

By the way, we have gained 57 rear wheel hp and 56 rear wheel torque over the already impressive stock numbers of 546 / 515.

Those are very impressive #'s...my old vette required heads,cam,full exhaust,and 8 pounds of boost from a procharger to reach those #'s!!!!