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Re: Dual 2.5" exhaust??
[Re: WO23Coronet]
#1333544
11/13/12 08:10 AM
11/13/12 08:10 AM
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Joined: May 2012
Posts: 100
Tennessee
meep_meep
member
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member
Joined: May 2012
Posts: 100
Tennessee
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Quote:
The back pressure thing I don't understand, IMO it's a bunch of nonsense, like how 15-20 years ago the common knowledge was that a turbo NEEDED back pressure to work properly which is BS. Back pressure makes an engine work harder, costing efficiency. And really, an engine turning ~2000 rpm at 20% throttle opening doesn't care if you have a single 2.5" or 3" or dual 2.5", you wouldn't have back pressure with any of them since you aren't flowing enough air/exhaust to max any of them out and it would be a wash from a mileage stand point IMO. Where you will notice it is when you do want to play (which you will) and get on it.
BTW, a single 3" pipe has less surface (7.065 sq in) than a dual 2 1/4" (7.95"), but the 3" has less boundary area than a dual 2 1/4" so it's probably a wash and they flow a similar amount of air. Remember, 250 hp Dakota RT's came with a single 3" system from the factory (along with the 98 and later rams, they may have 2 3/4" systems though)
Your exhaust guy may be feeding you a bit of a line about "back pressure" cause a lot of places don't like bending anything bigger than 2.5", go with the 3" single
+1....the back pressure thing is nothing but a bunch of malarkey..
A engine is basically a air pump, just like a vacuum cleaner...anyone that thinks a engine will perform better with "back pressure" needs to go out to their garage/shop...turn on their shop vac, then partially block off the exhaust port on the vacuum with their hand, then see how much better it sucks crap off the floor with your hand over the exhaust.. 
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