Are you running a resonator?
For some reason, there was somethign with the Beta that just drones at highway speeds on aftermarket mufflers. I tried the Turbo's, flowmaster, magnaflow (knockoff) and came back to the stock. I ran them on the stock resonator, and a longer cherrybomb resonator midpipe. Nothing helped. They were all noisy to me. With the intake, I really didn't lose much (if any) f the long term gain the bigger exhaust offered but I could drive it for hours on end and not be an issue.
Powered by Invision Power Board (http://www.invisionboard.com)
© Invision Power Services (http://www.invisionpower.com)