jolambright
forum member
Can't seem to locate any online, does anyone know a place/company that sells this that doesn't show easily on google. With Cats
11-14 5.0 2.5 inch catback with LT H
- Thread starter jolambright
- Start date
Well it really depends what kind of headers you have? You should probably look at whomever makes the headers, most can be ordered with a mid pipe. If you need cats some come with them or you can get some welded in. You can't just order any cat back and hope it fits.
jolambright
forum member
Thanks for replying 07 Boss, per the title I'm looking for the LT headers with the catback so they would work together.
I can spend your money for you. Kooks longtubes with a catted x pipe. Borla over the axle pipes and Borla S-Type axle backs.
2.5 is for a v6
2.75 is stock on the 5.0's
3 inch is most aftermarket.
2.5 is for a v6
2.75 is stock on the 5.0's
3 inch is most aftermarket.
jolambright
forum member
Wish it was that easy
https://www.svtperformance.com/thre...of-the-stock-exhaust-on-the-13-14-gt.1103295/
From the pics of the stock exhaust, a 2.5 catback would be a tad larger than the stock. True where the axle back connects are 2.75 but that's just the ending
I haven't found any kooks that size for our cars
Aftermarket isn't going to restrict their setup, to make power they remove all those weird transitions and step up size starting at the header collector back. They will transition at the end to go back to factory over axle pipes etc.
oldVOR
forum member
jolambright - Your assumptions of the factory exhaust diameters are incorrect and the post on SVT isn't completely accurate either with many of the pics showing a 15+ exhaust system.
The factory 11-14 exhaust is 2.75" from behind the CATs to just after the ball and socket joints where the pipe necks down to 2.25" and then steps back up to 2.75" prior to the "H" crossover connection, after the "H" connection, the pipes are 2.75" to the resonators where the pipe necks down to 2.5" and then steps back up to 2.75" after the resonators and maintains 2.75" back to the mufflers.
Kooks LTHs have 3" collectors, both Kooks X and H pipes are 3" and step down to 2.75" to marry up to the factory intermediate (over the axle) pipes at the slip fittings located near the factory driveshaft center support.
Hope this helps!
The factory 11-14 exhaust is 2.75" from behind the CATs to just after the ball and socket joints where the pipe necks down to 2.25" and then steps back up to 2.75" prior to the "H" crossover connection, after the "H" connection, the pipes are 2.75" to the resonators where the pipe necks down to 2.5" and then steps back up to 2.75" after the resonators and maintains 2.75" back to the mufflers.
Kooks LTHs have 3" collectors, both Kooks X and H pipes are 3" and step down to 2.75" to marry up to the factory intermediate (over the axle) pipes at the slip fittings located near the factory driveshaft center support.
Hope this helps!
Oh I thought you had the headers and was looking for a cat back that would bolt up to it. So you're looking for headers and catted mid-pipe? A 2.5" one at that? I think that is going to be kinda small for a 5 l motor but to each their own. I think at this point you should just get the headers you want and have an exhaust shop fab up some 2.5" piping with cats. If it was me I would just buy headers with a 3" catted mid-pipe and call it a day.
What is your reasoning for wanting the smaller pipe?
jolambright
forum member
You're saying the exhaust size of 15+ is smaller than 11-14?
Is there a link where this information is stated that you got it from or did you measure it yourself?
jolambright
forum member
From my understanding when going larger exhaust the sound is louder and it changes the torque band so would lose some low end to gain high end. So I wanted one barely bigger than stock to keep more low end while gaining up top some.
I don't know if louder is so much as a factor as tone. Your muffler and cats will be the biggest influence on how loud it is.
Finding the right exhaust is dependent on many different factors. You have to find a balance between volume vs velocity vs restriction. Your torque curve will be mainly determined by which headers you get. Primary diameter and length along with collector size will determine the size and shape of your torque curve more than your cat back pipes. Though any restriction or back pressure in the pipes will effect the efficiency of the header to do its job. In my book get the proper headers for your application and then run the biggest pipes back without losing too much velocity. But with cats and mufflers the pipe size will not be much of a factor unless you go too small. Pick primary size and length based on where you make peak torque or where your engines volumetric efficiency is the best and look for about 250 fps exhaust flow rate. This will give you the best performance gains. And then from there you can shorten or lengthen primary length to move power above or below that point.
Finding the right exhaust is dependent on many different factors. You have to find a balance between volume vs velocity vs restriction. Your torque curve will be mainly determined by which headers you get. Primary diameter and length along with collector size will determine the size and shape of your torque curve more than your cat back pipes. Though any restriction or back pressure in the pipes will effect the efficiency of the header to do its job. In my book get the proper headers for your application and then run the biggest pipes back without losing too much velocity. But with cats and mufflers the pipe size will not be much of a factor unless you go too small. Pick primary size and length based on where you make peak torque or where your engines volumetric efficiency is the best and look for about 250 fps exhaust flow rate. This will give you the best performance gains. And then from there you can shorten or lengthen primary length to move power above or below that point.
oldVOR
forum member
The link you posted at SVT forum had some information that was from '11-14's, however, many of the pics and measurements were from '15+ exhaust systems.
The measurements I provided were from my 2014 GT OEM exhaust system.
jolambright
forum member
Are you saying that going to a 3 inch catback shouldn't have any lower torque as long as the header is appropriate for the output?
Say using 1 3/4 long tube from arh for n/a or fi with their catback with cats will see no drop on the low end?
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