Yes it will because the air has more place to go out. Also you could fit a bigger exhaust. If you used the D.I.Y mathod it is illegal, but if you got a tuning company to do it, it is legal.
it is called a silencer which makes the exhaust less noisier
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.
drill holes in the pipe
start with your head A muffler with holes in it would sound like a muffler with holes in it, terrible. Drilling holes in the muffler would increase the chance of getting exhaust fumes in the vehicle which is a bad thing.
You can drill holes in aluminum with a drill as long as you have the proper drill bit. Use a regular drill bit and keep speed moderate.
A drill makes holes in things.
To drill holes
The Drill Press is used for drilling holes in various materials.
Drill bits are for fitting into a drilling machine to drill holes.
Drill bits are for fitting into a drilling machine to drill holes.
You can drill very accurate sized holes, you can drill very large holes with the use of hole saws, you can drill many identically placed holes, with use of jigs you can drill holes in many sheets of thin materials if clamped together, you can drill large holes in very thin materials with use of a fly cutter, you can drill holes to a precise depth with Forstner bits. you can mill things flat with milling bits and many more things - a drill press is a very versatile machine
A pillar drill is used for larger holes, more exact placing of holes, or drilling repeated holes with a jig to insure uniformity.