These ROE Racing Polished Aluminum Smooth Tubes are slightly different in design than the original GT2/ACR smooth tubes, which are straight silicone tubes of the same diameter as the airbox outlet and throttle body. The ROE tubes are much larger in diameter (3”) than the throttle body’s OD and are aluminum in construction which will not distort and crush down from heavy vacuum like a straight poly/silicone tube could. Notice the size of the taper on the bottom black silicone segment as the 3” aluminum tube meets the smaller factory throttle body.
To commemorate their 1998 FIA GT Championship and the 1998 24 Hours of Lemans GT2 victory, Chrysler built 100 street-legal “GT2 Championship Edition” Vipers in 1998. All of the cars were white with blue stripes, had a GTS-R inspired wing, front dive planes, a racing harness and a factory rated 10bhp increase (460hp) due to K&N air filters and “smooth intake tubes” that replaced the corrugated rubber tubes that connect the airbox to the throttle bodies. In 1999 the Viper ACR was introduced and also had the same “smooth tubes” and air filters with a 460hp rating.
We already saw a close to a 15whp peak gain from K&N air filters alone, which is greater than the factory rated 10hp bump for the GT2 and ACR cars, so how much more would these smooth tubes actually improve? There is a lot of hearsay on Viper forums for how much power smooth tubes actually make, so we were looking forward to the results of this proper back to back comparison of the smooth tubes compared to the stock corrugated tubes.