Yes! Then you would have triple exhaust.
You can drill a hole in anything as long as you have a strong enough drill bit and drill. But why would you want to drill holes in your exhaust? The exhaust piping is there to route exhaust gases away from underneath the car so they don't pool up underneath your car and seep into the cabin and cause a variety of health problems.
true dual by far
The advantages of having dual exhaust, if it is a true dual exhaust, include increased gas mileage, cooler engine temperature, and more engine horsepower. However, if it is not a true dual exhaust, it doesn't matter how many exhaust ports there are, there will be no advantage.
You can drill a hole in the side of anything with the right drill.
Dual exhaust systems are systems in cars that have two mufflers and two exhaust pipes. This system is called a dual exhaust system, or a twin exhaust system. It can be installed on a vehicle after market.
you can cut a hole in wood using a special drill attachment. alternatively you could drill a hole then cut a hole with a jigsaw
by having a exhaust shop weld on a y pipe then just run the dual pipes out the back
True dual exhaust is better for performance. Most cars on the road nowadays have the "fake" dual exhaust - tips only. They feed via the catalytic converter then after the rear axle - they branch into dual (or Y shaped) thus making the appearance of dual exhaust.
dual exhaust
Dual exhaust systems increase capacity of the exhaust system and thus makes it easier for exhaust gasses to exit the combustion chamber. This can result in increased horsepower. However, dual exhaust is often used because the owner prefers a more "throaty" sound.
If you want it to grip, drill a 9/64 hole. For a clearance hole, drill 7/32.
I have a 1976 F100 and yes I put Dual Exhaust on the truck and it is great!!