1987 Buick Grand National Fuel System Exhaust Upgrades Exhaust Flow Enhancement
1987 Buick Grand National Fuel System Exhaust Upgrades Exhaust Flow Enhancement
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It's obvious the flange collector/reducer area of the Pypes exhaust shows a major flow improvement. The new system is mandrel-bent, meaning there is no loss of diameter at the bends, 2.5-inch verses the stock crimp-bent 2.25-inch piping, with .25- to .5-inch loss of diameter at the bends. The new larger mandrel-bent pipes will enhance exhaust flow. View Related Article
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