
The weight of that heavy and thick-walled steel construction, not the rolled tinfoil crap you see today. The only downer is the color, which fades shortly after installation. . When you put it on a car, it doesn't matter (how many times you or someone else looks under your car to admire it). High temperature paint on the manifold will fix the imperfections, I recommend the chrome version instead of the bike paint if you like beauty. . You'll have to retune some carburetors and change the exhaust flow to keep your exhaust valves from burning, but the power gain is very noticeable at highway speeds.

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