💪 Twin Turbo Buick Grand National Grand National Exhaust System
3.5 DP w/3" exhaust w/Magna flow 3" race muffles. S&S Cycle Installation - H-D® Dyna® 2 into 2 Grand National Exhaust System 1987 buick grand national side exit exhaust 1987 Buick Regal Turbo T 4.5 Soft launch 0-60 High Performance 2:1 Style exhaust system designed to make optimum power with a deep throaty exhaust note. Does not require tuning. Finally a good run, spiked at 23 psi. Installed a GN1 4 inch exhaust to! so these things are notorious for cracking the driver side hedder.. i had both hedders crack on me and the cross-over pipe leaks ...