heres a 90 ss454 with 40's on it, it has stock manifolds, no cats, and true 2.5in. duals all the way back. The video does no justice to how it sounded. I miss it, it was quick and sounded sweet. It was my dads (1968SWBBigBlock). But its gone now, and we have the 68 to tinker with. Which will be getting 2.5in duals through 40's
