Picture of SS Muffler tip
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In this Instructable the makeing of a stainless steel muffler tip made from a recycled water canister/thermos
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Step 1: Deciding on placment

Picture of Deciding on placment
The appearance of an aftermarket muffler tip that will not rust and costs you under 3 dollars.

You have 2 options when you make this muffler tip, the opening of the bottle may not be big enough to slide onto your existing muffler, so an addition cut may be needed on the top of the canister.
If no cut on the top end are needed it will be one less step. 
Also Depends on the direction of use for the canister.
Try and select a reusable water can that will only need one cut.

Materials needed for this Instructable are as follows: 
  -A stainless steel reusable water container,thermos.
  -Angle grinder with a cut off disk
  -Drill/Drillpress and drill bits 
  -Permanent marker
  -Bolts your choice on size (1-3)
  -Metal file (optional) 
  -Metal Punch (optional)
  -Mitre block (optional)

Note: In this picture the water canisters top is facing outward. Only one cut was done. 

Step 2: Cutting

Picture of Cutting
Take the lid off your canister and look inside. Most canisters have a bottom that is inserted and this creates a line on the inside of the canister allowing your judgment of how big your cut from the bottom of the can is.
When decided on your cut use a pice of card stock paper, cardboard,cardboard tube to guide you toward a straight line to cut on.
Use your angle grinder and don`t forget your safety glasses and cut all the way around on your line. 
use a mitre block to hold the canister in place while cutting, a vice will work too or the ground aslong as there is something to protect it from scratches while cutting.
If you are making 2 cuts on your canister, your judgement will be needed as where else you are cutting. 
You can use a metal file if needed to clean up the edges
paintphone (author) 2 years ago
@ audreyobscura- It is for esthetic purposes does not improve gas mileage or horsepower, just beats spending up to 30 dollars for one in the store.
What is the benefit of putting a tip like this on your muffler?