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Help on 2.5" too 3" exhaust piping for a NA SXT


 
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852jamaica
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Age: 52
Joined: 01 Feb 2017
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Post: #1   PostPosted: Sun Apr 23, 2017 7:28 am    Post subject: Help on 2.5" too 3" exhaust piping for a NA SXT Reply with quote

I am putting in a new exhaust on a NA 2.0. I'm using an OBX LT header and after the collector pipe I plan to attach a 2.5" carsound or vibrant cat. I need help deciding if I should transition to a 3" muffler or stay with a 2.5" muffler, for flow velocity consideration. I will be going to 3" no matter what some length after the muffler. Plan on using an oval Dynomax ultraflo so wonder if going 3" would be less noisy because of greater muffler area, but I'm concerned about lowered flow velocity through the muffler and I don't want it to effect performance. Also, I am assuming that anything after the muffler is ambient air hence finishing with 3" piping cause it was available as a cheap SS kit.
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blueneo03
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Age: 27
Joined: 02 Feb 2009
Posts: 1200
Location: Little Rock, AR

2005 Dodge Neon SXT

Post: #2   PostPosted: Tue Apr 25, 2017 8:25 am    Post subject: Reply with quote

From what i have seen on here over the years, you want to avoid anything bigger than 2.5 on NA 2.0s. bigger than that will do nothing for you and could hurt performance.

i would think you want to keep everything the same sizing through to keep a consistent flow.
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occasional demons
Mr One World
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Age: 52
Joined: 03 May 2007
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Location: Ashland, Ohio

2001 Dodge Neon ES

Post: #3   PostPosted: Tue Apr 25, 2017 8:39 am    Post subject: Reply with quote

An LTH, with 3" diameter anything is going to be very loud and obnoxious. A cat may help with the rasp, but large diameter pipe does not keep sound levels down.

Large pipe outlets also mean a large inlet for atmospheric pressure to push back in. Even more so with a 2.0, because the 2.0 won't create enough velocity to move the air mass against it.



A muffler would need to be substantially larger to have the same sound absorbing level with a 3" inlet/outlet over one with a 2" inlet/outlet. Most mufflers have the same case size, and just change the pipe size. Larger pipe means less room for sound absorbing material. It also gives the sound waves an easier path out of the muffler.

And some mufflers just neck the inner pipe to a common size, regardless of the inlet/outlet pipe size. Dyno Max/Walker is good for that. Their 2.5" and 3" mufflers are actually 2" to 2.5" for the inside tubing.

That's the beauty of living close to Summit Racing: You can go there and look at the parts before you buy them.

Unfortunately, I now live about an hour away, instead of 15 minutes. Sad
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