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Picking out what long tube headers I want to go with from Stainless Works with catted mid pipes. Going to be staying NA, probably with a cam. I have a 3" aftermarket exhaust already. Which primary diameter should I get?
 

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2010 R/T Classic 6M
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For N/A I recommend 1 7/8
 
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2015 RT 5.7 M6
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I am running SW 2" on my 5.7 but it is running a PD supercharger and a 6.2 cam. The 2" give very little room for bolts.
 

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2" primaries are to big, 1 7/8 are a better choice.
 

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2015 SRT 392
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I vote for the 1 7/8" ones. The bigger tubes work better on a car that is blown or a stroker motor turning some rpm's, but in a street driven N/A car, you want the exhaust velocity to be a bit higher because it helps with scavenging. If you want more low end and mid range power, then I'd recommend that you get the smaller header.
 

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Picking out what long tube headers I want to go with from Stainless Works with catted mid pipes. Going to be staying NA, probably with a cam. I have a 3" aftermarket exhaust already. Which primary diameter should I get?
This vid may help your decision..

 

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2015 RT 5.7 M6
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This vid and the one from engine masters comparing 2.5 and 3 inch exhaust along with dual vs X vs H pipe were enlightening.
 

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This vid and the one from engine masters comparing 2.5 and 3 inch exhaust along with dual vs X vs H pipe were enlightening.
Yeah its nice to see actual data.. I have Motor Trend on demand. I have watched all of the Engine Masters, some more than once. I was actually looking for the Engine Masters vid, but couldn't find the YouTube version so posted that one.

Sent from my SM-T350 using Tapatalk
 

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2015 RT 5.7 M6
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Yeah its nice to see actual data.. I have Motor Trend on demand. I have watched all of the Engine Masters, some more than once. I was actually looking for the Engine Masters vid, but couldn't find the YouTube version so posted that one.

Sent from my SM-T350 using Tapatalk
Lol same here but literally binge watched all of roadkill & roadkill garage. Boost caboose still makes me laugh!
 
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