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'99 - '06 GM Truck Modifications
Engine & Performance
DIY Exhaust Thread-Dynomax Bullet
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<blockquote data-quote="01ssreda4" data-source="post: 5482" data-attributes="member: 477"><p>Total length of the stock assembly we removed:</p><p></p><p><a href="http://s275.photobucket.com/user/01ssreda4/media/Yukon%20XL/IMG_20140308_112727_324_zps54743acb.jpg.html" target="_blank"><img src="http://i275.photobucket.com/albums/jj294/01ssreda4/Yukon%20XL/IMG_20140308_112727_324_zps54743acb.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a></p><p></p><p>Total length of our new Y merge and muffler, directly connected to each other:</p><p></p><p><a href="http://s275.photobucket.com/user/01ssreda4/media/Yukon%20XL/IMG_20140308_112814_301_zpsc8269a06.jpg.html" target="_blank"><img src="http://i275.photobucket.com/albums/jj294/01ssreda4/Yukon%20XL/IMG_20140308_112814_301_zpsc8269a06.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a></p><p></p><p>Factoring in a little bit of room at the backend for our bend, we want to subtract these two figures, and </p><p>cut the stock pipe somewhere in that vicinty. Well, this ends up working out well because it is just behind</p><p>our front hanger. Which means it serves as a good marker for reference, and we will end up reusing it exactly</p><p>as the factory intended. The Xs mark where I'm going to cut, its an estimate and we will make up our distance</p><p>on the rear side.</p><p></p><p><a href="http://s275.photobucket.com/user/01ssreda4/media/Yukon%20XL/IMG_20140308_112921_202_zpsaf70123a.jpg.html" target="_blank"><img src="http://i275.photobucket.com/albums/jj294/01ssreda4/Yukon%20XL/IMG_20140308_112921_202_zpsaf70123a.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a></p><p></p><p>Now, before you make your cut, you will want to affix your twin pipes together. The reason is the muffler is</p><p>the only thing holding their correct orientation. Once you remove it, they will fall apart. By affixing them</p><p>together ahead of time, they will reinstall exact as they were designed to stock. Here I've inserted some</p><p>scrap metal pieces along the center of the two pipes. After my cut, they stay put.</p><p></p><p><a href="http://s275.photobucket.com/user/01ssreda4/media/Yukon%20XL/IMG_20140308_114740_672_zps8ebba1c2.jpg.html" target="_blank"><img src="http://i275.photobucket.com/albums/jj294/01ssreda4/Yukon%20XL/IMG_20140308_114740_672_zps8ebba1c2.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a></p><p></p><p>This next step is where you will need your welder. The stock pipes are approx 2 3/4". The Y merge is 3 in, 3 out.</p><p>You need to adapt these. What I did for simplicity was make small lengthwise cuts (about 1 inch) around the</p><p>perimeter of the larger two pipes, then hammered them down around the stock pipe. This is a very quick and</p><p>effective way to adapt the two sizes and will reduce the gap between the pipes to a manageable level that you</p><p>can fill in with a MIG welder. So after you've done that, you should have this....I left the stock muffler there</p><p>so you can get a visual comparison.</p><p></p><p><a href="http://s275.photobucket.com/user/01ssreda4/media/Yukon%20XL/IMG_20140308_131101_241_zps35fa547f.jpg.html" target="_blank"><img src="http://i275.photobucket.com/albums/jj294/01ssreda4/Yukon%20XL/IMG_20140308_131101_241_zps35fa547f.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a></p><p></p><p>-------------------------</p></blockquote><p></p>
[QUOTE="01ssreda4, post: 5482, member: 477"] Total length of the stock assembly we removed: [URL=http://s275.photobucket.com/user/01ssreda4/media/Yukon%20XL/IMG_20140308_112727_324_zps54743acb.jpg.html][IMG]http://i275.photobucket.com/albums/jj294/01ssreda4/Yukon%20XL/IMG_20140308_112727_324_zps54743acb.jpg[/IMG][/URL] Total length of our new Y merge and muffler, directly connected to each other: [URL=http://s275.photobucket.com/user/01ssreda4/media/Yukon%20XL/IMG_20140308_112814_301_zpsc8269a06.jpg.html][IMG]http://i275.photobucket.com/albums/jj294/01ssreda4/Yukon%20XL/IMG_20140308_112814_301_zpsc8269a06.jpg[/IMG][/URL] Factoring in a little bit of room at the backend for our bend, we want to subtract these two figures, and cut the stock pipe somewhere in that vicinty. Well, this ends up working out well because it is just behind our front hanger. Which means it serves as a good marker for reference, and we will end up reusing it exactly as the factory intended. The Xs mark where I'm going to cut, its an estimate and we will make up our distance on the rear side. [URL=http://s275.photobucket.com/user/01ssreda4/media/Yukon%20XL/IMG_20140308_112921_202_zpsaf70123a.jpg.html][IMG]http://i275.photobucket.com/albums/jj294/01ssreda4/Yukon%20XL/IMG_20140308_112921_202_zpsaf70123a.jpg[/IMG][/URL] Now, before you make your cut, you will want to affix your twin pipes together. The reason is the muffler is the only thing holding their correct orientation. Once you remove it, they will fall apart. By affixing them together ahead of time, they will reinstall exact as they were designed to stock. Here I've inserted some scrap metal pieces along the center of the two pipes. After my cut, they stay put. [URL=http://s275.photobucket.com/user/01ssreda4/media/Yukon%20XL/IMG_20140308_114740_672_zps8ebba1c2.jpg.html][IMG]http://i275.photobucket.com/albums/jj294/01ssreda4/Yukon%20XL/IMG_20140308_114740_672_zps8ebba1c2.jpg[/IMG][/URL] This next step is where you will need your welder. The stock pipes are approx 2 3/4". The Y merge is 3 in, 3 out. You need to adapt these. What I did for simplicity was make small lengthwise cuts (about 1 inch) around the perimeter of the larger two pipes, then hammered them down around the stock pipe. This is a very quick and effective way to adapt the two sizes and will reduce the gap between the pipes to a manageable level that you can fill in with a MIG welder. So after you've done that, you should have this....I left the stock muffler there so you can get a visual comparison. [URL=http://s275.photobucket.com/user/01ssreda4/media/Yukon%20XL/IMG_20140308_131101_241_zps35fa547f.jpg.html][IMG]http://i275.photobucket.com/albums/jj294/01ssreda4/Yukon%20XL/IMG_20140308_131101_241_zps35fa547f.jpg[/IMG][/URL] ------------------------- [/QUOTE]
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'99 - '06 GM Truck Modifications
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DIY Exhaust Thread-Dynomax Bullet
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