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SportTrac Discussion
Engine & Drivetrain
2.5" exhaust on a ST?
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<blockquote data-quote="EddieS&#039;04" data-source="post: 1023763" data-attributes="member: 61136"><p>With a V6 I would stay with 2.25" or 2" for dual tail pipes..If you are planing on single in dual out muffler. One reason loss of low end engine torque going too large. The other is clearance. Aftermarket single cat-back kits are 2.5". That is ok. </p><p></p><p></p><p></p><p>I had a plan to do do true duals from the RT-Ypipe, I hope. $600 worth of SS cats, x-pipe, mufflers, tubing and tips is the issue. Not including labor. I plan on using 2" or 2 1/8", front to rear. As to keep the low end torque up. 2 1/8" would keep the top end HP up. Our 4.0L air pumps have 4" pistons and almost the same stroke.</p></blockquote><p></p>
[QUOTE="EddieS'04, post: 1023763, member: 61136"] With a V6 I would stay with 2.25" or 2" for dual tail pipes..If you are planing on single in dual out muffler. One reason loss of low end engine torque going too large. The other is clearance. Aftermarket single cat-back kits are 2.5". That is ok. I had a plan to do do true duals from the RT-Ypipe, I hope. $600 worth of SS cats, x-pipe, mufflers, tubing and tips is the issue. Not including labor. I plan on using 2" or 2 1/8", front to rear. As to keep the low end torque up. 2 1/8" would keep the top end HP up. Our 4.0L air pumps have 4" pistons and almost the same stroke. [/QUOTE]
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SportTrac Discussion
Engine & Drivetrain
2.5" exhaust on a ST?
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