tktrain Posted June 14, 2011 Share Posted June 14, 2011 I have a question about the exhaust system on my 2010 sport. I went to the Ford Parts web site and looked up the exhaust system for the car and got the attached illustration. The item descriptions refer to the car as having two three way cats attached to the exhaust manifolds. There is then an exhaust pipe assembly that connects the two cats (item #5G274 in the illustration) and then back to the flex pipe/front muffler (item #5A289), then a resonator and the rest of the exhaust system back to the dual mufflers and outlets. The question is this: Does anyone have any insight into the shape in the exhaust pipe assembly, item #5G274? This pipe comes down from the front and makes about a 75 degree turn going basically straight toward the rear. The rear cat has a nearly 90 degree turn sending the exhaust toward the front of the car for about 4 inches and then abruptly makes a 180 degree turn toward the rear where it joins together with the pipe from the front cat. Why on earth did Ford choose to send the exhaust from the rear through 270 degrees of turns when it looks like it would have been very easy to simply turn the rear cat exhaust 90 degrees to the rear and Y it into a common pipe and save nearly 180 degrees of tightly radiused pipe? My only explanation is that it was done for assembly line tooling clearances and the design of the drivers used to install the nuts for the exhaust.to rear cat connection. If anyone has seen how these cars are assembled perhaps they could give some insight into this odd design. This type of pipe arrangement has been used for may years on 2.5L and 3.0L V6 Fords for years. My '96 2.5L Duratech Contour and my '05 3.0L Duratech Escape both have a very similar pipe system coming off the rear cat. I've always felt there is a great opportunity to enhance performance here. I spoke with my exhaust man today and he agrees. He's a 35 year high performance exhaust specialist who has built hundreds of drag car systems over the years. He has a 5.4L pickup and found something similar on it. He modified the pipes as I described on his truck and said it made a noticeable improvement in throttle response. I'm going to let him mod my car when he installs my Magnaflow cat back system. He wants to do the Magnaflow first and let me drive it a few days, then come back and do the pipe mod to see if it has any effect. 0 Quote Link to comment Share on other sites More sharing options...
tktrain Posted June 14, 2011 Author Share Posted June 14, 2011 The image attached. 0 Quote Link to comment Share on other sites More sharing options...
Jim Rockford Posted May 15, 2012 Share Posted May 15, 2012 Yea I have seen the rear exhaust pipe and thought "What was this guy smoking " .... 0 Quote Link to comment Share on other sites More sharing options...
FusionDiffusion Posted May 15, 2012 Share Posted May 15, 2012 My guess is that the odd angles have to do with the exhaust tuning. I think ideally you would want the distance between the cats and the resonator to be the same for both banks, so to lengthen the rear exhaust, they had to make it come foreword before turning around and joining the other bank at the Y. They did this in the most compact way possible due to space considerations. You have to remember the intake and the exhaust are tuned like musical instruments, so the size and distance between features (splits, cats, mufflers, etc) are all carefully designed. It's easy for the average joe without an engineering background to just look at something and conclude it was done stupidly without any further thought. Honestly I think the engineers were very clever with a lot of the design, especially the powertrain components. Getting that big DOHC 3.5L engine to fit in a moderately small engine bay with a power steering pump and an easily accessible oil filter is pretty cool to me. 0 Quote Link to comment Share on other sites More sharing options...
Jim Rockford Posted May 18, 2012 Share Posted May 18, 2012 Yea mashing the crossover pipe flat was a great plan....Bean counters have more to see about how a car is designed than the engineers. 0 Quote Link to comment Share on other sites More sharing options...
Badmamerjamma Posted July 5, 2012 Share Posted July 5, 2012 When you get everyone down with the exhaust, put a video link on here so we can know what it sounds like. I can decide if i should get a borla or magnflow for my 10' sport. thanks for the post. I learned something new today about my car. 0 Quote Link to comment Share on other sites More sharing options...
silver fuze Posted July 18, 2012 Share Posted July 18, 2012 The image attached. Sorry I can't contribute to your post, but I am interested in where you got this diagram. Can you send me the link. I'm interested in adding a dump tube before the cat for drag racing & I wanted to find out the dia. of the pipe. Thanks 0 Quote Link to comment Share on other sites More sharing options...
Fusionpursuit Posted July 31, 2012 Share Posted July 31, 2012 Anyone know the difference between the 6Z ***** 5230 B (Lincoln) and the 5Z ******* B (Fusion Sport) cat-backs? I have hardly seen a Lincoln MKZ rear lately, its like $20 dollars more. Is the exhaust tip different? chrome vs brushed aluminum on the Sport? 0 Quote Link to comment Share on other sites More sharing options...
Linc Posted December 30, 2015 Share Posted December 30, 2015 Did TKTRAIN ever get his new Y-Pipe made and did it work out? I was just under my car and the comment about "smashed" pipe is clearly accurate. I am thinking that the benefits for the Borla or Magnaflow exhaust are minimize by the restriction of the factory Y-Pipe. Have there been any testing for the Y-Pipe restriction? 0 Quote Link to comment Share on other sites More sharing options...
Linc Posted July 21, 2016 Share Posted July 21, 2016 Is this forum dead? 0 Quote Link to comment Share on other sites More sharing options...
hermans Posted July 21, 2016 Share Posted July 21, 2016 The forum isn't dead, but this thread appears to be. 0 Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.