Use the tin snips to cut the top and bottom off of your soda can and then cut the can lengthwise, down the center. I’m just using an abrasive pad on the angle grinder. Remember, safety always comes first! With all of the old repairs removed I then cut a new piece of exhaust tubing that fills the gap between the old pieces and also allows the two pipes to slip inside. Use a permanent marker to create a reference line for the cut you need to make. This will help establish a seal between the pipes and prevent any exhaust from leaking at the joint. The magnet stuck to the mig weld strongly letting me know for sure that the weld was carbon steel. 2, What tools do you use to cut the pipe? If you are working with older exhaust piping which maybe rusted, that rust must be removed in order to get a proper weld. After you mark the spot, cut the remaining exhaust to get the perfect fit. For headers make sure you get a few U bends at different radii. Use safety glasses and gloves. Flush the pipe with water to remove all the sand you had put initially. 3, How do you hold the pipe in place to tack weld it 4, If you want to weld a pipe into the side of another pipe, how do you cut and mark it out? This is aluminized exhaust pipe, it has a coating which needs to be removed before welding. Flex pipes usually have two clamps. I have a air angle grinder/cutoff tool but my compressor isn't really up to the task and given the 50% duty cycle, it takes about 20 minutes to make a sloppy cut. 3. Spray exhaust sealant on the ends of both pipes. Now, fix the exhaust clamp, one on each side of the exhaust pipe, on top of the flex pipe. Heavy duty pipe cutters are expensive and the moderately priced $30-50 exhaust cutting tools seem to "spiral" on the pipe easily. Think Safety and Take Your Time. By the way, its a good idea to have keep a magnet handy for jobs where you are not really sure of the metal type. Take your time to ensure a clean, easy cut. Place it properly and mark the location where you will weld the exhaust pipe. Carefully wrap it around the damaged area securing the steel wool to the exhaust pipe. So, after you slide the flex pipe over one side of the cut exhaust pipe, connect the other part of the exhaust pipe. You May Like : Exhaust Clamps vs. Welding; How to weld exhaust pipe; 11 Best MIG Welders 2020; Final Word. Get the repair tape and remove the backing to expose the sticky side. to balance and guide the tip of the torch, ( ensure you use a welding glove ) weld down hill for about 3/4 of an inch starting near the top of the pipe, then rotate the pipe so you can weld another 3/4 of an inch down to meet the first run, this will let the pipe cool as you rotate and set up again. 2. Use Pipe Wrap and a Permanent Marker. Yeah the V6 Mustangs only had 1 rear exhaust on them, you could easily go to any muffler place and have them weld a Y after your cat and bring two pipes out the back and get two cherry bombs for a nice sound and throw two nice tips on there max $100 and you get a good sound lol At this point, the exhaust pipe is ready to install. At this point, the sound of your vehicle should be better. Bearing in mind this is DIY on limited budget. 1, How to do mark the pipe to get the correct angle? Because of all the waste pipe, it's better to buy the bends then cut and weld. Use pipe wrap around the pipe, making sure that the sides of the wrap are even and square on the exhaust pipe. Refer to the instructions on the exhaust sealant to know how long to let it cure. JC Whitney sells mandrel bends (no "crimp" on the inside of bends) in various angles. Then you can cut whatever degree turn you need. 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