Here is what I do, it works well with a stock motor. If later on you decide to go with a big bore and cam you will need to replace the exhaust system, but until then this works fine. You will need a hack saw,1" hole saw, 3/4" wooden dowl, 2" length of 1 1/4 od pipe/conduit, and access to a welder.
First cut the tail pipe as close to muffler as possible. next cut a piece if 3/4" wooden dowl and drive in remaining tail pipe this is used in order for hole saw to make pilot hole. Now with the hole saw drill out that tail pipe completely. Once drilled out lightly tap in your 1 1/4" od pipe than weld. This will increase the flow of exhaust and sound pretty good without increasing noise level much. The wooden dowel can be purchased at any hardware or lowes. If you know an electrician you can get some scrap ends of conduit. Any thin walled pipe will work once you have this in place if you don't have or know anyone with a welder than take it to the local muffler shop and have them weld it. TOM
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