PIREPS on my -4
I have an RV-4 with an O320H2AD and Vetterman 4 pipe "Harley exhaust". I have all 4 tips turned inward about 15 degrees. I have Halos front and rear, and cockpit noise is minimal...to me, there is no substitute for the Halos, and my BIB agrees. I have been told by many (on the ground)we are one of the loudest strongest sounding RV's around and I have been asked several times if I'm running a six cylinder...Love the pipes, and the Halo's.