Down pipe and exhaust
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Tuned
Joined: Aug 2015
Posts: 396
Likes: 2
Down pipe and exhaust
Looking for some info on a 3 in down pipe. Which one is a good one to get? My truck has a stock exhaust on it. I'd like to run the 3 in down pipe to a 4in exhaust all the way back, but am not sure do I put the muffler and cat back on the 4 in exhaust? Also what are the benefits of doing this? Will it increase mpg? Will I be able to hear the turbo whistle more? The truck has no other mods to it.
Hotshot
Joined: Dec 2012
Posts: 11,278
Likes: 1,658
From: Las Cruces New Mexico
Looking for some info on a 3 in down pipe. Which one is a good one to get? My truck has a stock exhaust on it. I'd like to run the 3 in down pipe to a 4in exhaust all the way back, but am not sure do I put the muffler and cat back on the 4 in exhaust? Also what are the benefits of doing this? Will it increase mpg? Will I be able to hear the turbo whistle more? The truck has no other mods to it.
Depends on your state laws, straight pipe is best, you'll have some drone but it wont be to loud.
Benefits, lower egts, faster turbo spool, and yes you will hear the turbo more when the windows are rolled down.
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Tuned
Joined: Aug 2015
Posts: 396
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I live in a rural area. Do I need to put the muffler and cat back on? Or go true open straight pipe all the way back? Is there a kit that has the down pipe and the 4 in straight exhaust all together? Sorry for the questions, I'm a total noon to diesels. Also would I be wasting my time by doing this with no intentions of putting a tuner on it or upgrading the injectors?
Hotshot
Joined: Dec 2012
Posts: 11,278
Likes: 1,658
From: Las Cruces New Mexico
As I stated above depends what your laws are in your area. You can just do the down pipe if you dont want the turbo back system. Have you seen how restrictive the stock down pipes is? That there is enough reason to change it out
Hotshot
Joined: Dec 2012
Posts: 11,278
Likes: 1,658
From: Las Cruces New Mexico
Turbo back means a complete exhaust from down pipe all the way to the back of the wheel. The one posted is a straight pipe, no muffler, and cat delete.
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Tuned
Joined: Aug 2015
Posts: 396
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My current exhaust is in good shape. Would I just need a cat and muffler delete along with a new down pipe. I'm gonna give riff raff a call tomorrow and talk it over with them.
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Hotshot
Joined: Dec 2012
Posts: 11,278
Likes: 1,658
From: Las Cruces New Mexico
If you want your exhaust loud straight piping is the way to go. If you want a quite exhaust than just buy the down pipe with cat delete
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Fleet Mechanic
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From: Knoxville, TN
summit racing generally has better prices...stainless is recomended for longevity
I bought the mbrp kit with muffler from summit...and I bought an extra 4' piece of exhaust pipe incase I wanted to delete the muffler later...
My designs were to have this as my long haul vehicle... as I put 35,000 miles on vehicles a year. Thats why I wanted to stick with the muffler at first.
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