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SportTrac Discussion
Engine & Drivetrain
Stock Y-pipe Cutaway
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<blockquote data-quote="Blown09" data-source="post: 1050155" data-attributes="member: 78012"><p>Pretty crazy how restrictive the stock y-pipe is on the 4.6. Cut the stock off today and went back with a flowmaster Y pipe, 2.5 in 3 out(a really great design-surprising I know). Small piece of 2.5 piping next to it for size comparison. Second pic is the crossover from the passenger bank. You can see the left bank is even worse with the double pipe(in the second pic). </p><p></p><p>Need to datalog the truck again, but she feels MUCH happier now. No muffler for now, so she’s also incredibly loud<img class="smilie smilie--emoji" loading="lazy" alt="😖" title="Confounded face :confounded:" src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f616.png" data-shortname=":confounded:" /> </p><p>Didn’t want to go back with the F150 muffler as it’s not a true 3” all the way through, 2.75” inlet and eventually opens to almost 3” at the outlet. As much as I liked that muffler, I wasn’t about to go through all this hassle to put another bottle neck back in.</p></blockquote><p></p>
[QUOTE="Blown09, post: 1050155, member: 78012"] Pretty crazy how restrictive the stock y-pipe is on the 4.6. Cut the stock off today and went back with a flowmaster Y pipe, 2.5 in 3 out(a really great design-surprising I know). Small piece of 2.5 piping next to it for size comparison. Second pic is the crossover from the passenger bank. You can see the left bank is even worse with the double pipe(in the second pic). Need to datalog the truck again, but she feels MUCH happier now. No muffler for now, so she’s also incredibly loud😖 Didn’t want to go back with the F150 muffler as it’s not a true 3” all the way through, 2.75” inlet and eventually opens to almost 3” at the outlet. As much as I liked that muffler, I wasn’t about to go through all this hassle to put another bottle neck back in. [/QUOTE]
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SportTrac Discussion
Engine & Drivetrain
Stock Y-pipe Cutaway
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