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post #1 of 42 (permalink) Old 07-22-2005, 12:30 AM Thread Starter
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True Dual Custom Exhaust on 2001 R/T

So, I got the true dual exhaust installed about a week ago. Did some research here and on the web about fuel economy. Seems like everyone else is getting better mileage. So far, I've taken at least a 3mpg hit. System is all 2.25 in. with a silver bullet resonator on each side, DNA Specialty Stainless Mufflers...no X-pipe or h-pipe (not sure what they do anyhow). Stock intake on engine. Whats the deal with my mileage. (already tried disconnecting the battery to reset computers). Thanks in advance.
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post #2 of 42 (permalink) Old 07-22-2005, 01:00 AM
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you should always use an x or h pipe so that in the event of a plugged cat or somehting, your exaust will have somewhere to go (other than out of a fitting, or your headgaskets!)
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post #3 of 42 (permalink) Old 07-22-2005, 01:39 AM
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post #4 of 42 (permalink) Old 07-22-2005, 02:46 PM
 
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You did 2 pipes all the way back from the headers? How? I would love to see pics of this...
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post #5 of 42 (permalink) Old 07-23-2005, 12:34 PM
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An H-pipe and an X-pipe are both what they call balance pipes. They balance out the flow pressure between both the pipes for better performance. Did you install it yourself or did you take it to a shop? I can't imagine a shop not putting in a balance pipe of some sort in. Mabe you have a 2-in 2-out collector that acts as a balance pipe. If not I would definitely get one installed.
As for gas milage, mine dropped after I got my exhaust system installed simply becaused it caused me to want to get on the gas pedal more. Once the novelty of the new mod wore off and I slipped back into normal driving habits, my MPG's were boosted. Keep in mind whenever you do a performance mod it takes a couple of weeks to a month for your car to fully adjust to it. That being said, install a balance pipe and give it about a month and then under normal driving habits, see where your MPG's are then.
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post #6 of 42 (permalink) Old 07-23-2005, 09:21 PM
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There are two kind of pipe, pressure equalization and sonic equalization.
Crossplane crank V8s have pressure equalization (aka X-pipe) because V8 are not even firing on their banks, L R L L R L R R

V6s, flat plane crank V8, inline 6s, boxing 6s, even firing V10, even firing V12s have sonic equalization. The developed exhaust pressure is equal in equal exhaust system, so only sound waves are shared.

Without an equalization pipe, your V6 will sound like two inline 3s work together (like a porsche 911-no equalization there)
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post #7 of 42 (permalink) Old 07-23-2005, 09:31 PM
 
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I have heard of x pipes or h pipes being used to lower the sound levels also
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post #8 of 42 (permalink) Old 07-25-2005, 01:40 PM
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They also give a richer sound, a porsche 911 doesn't sound that good, neither does a supra (single exhaust) BMW M3 sounds better than a surpa (quasi-dual exhaust), Audi Allroad 2.7tt & Lexus GS300 (inline6) sound damn good.
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post #9 of 42 (permalink) Old 08-02-2005, 10:33 PM Thread Starter
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Snag in the works...

I will have pics as soon as I can figure how to compress them (all larger than the 300KB that I'm allowed) and get them uploaded.
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post #10 of 42 (permalink) Old 08-02-2005, 11:05 PM Thread Starter
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post #11 of 42 (permalink) Old 08-03-2005, 12:15 AM
 
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are those crimped pipes or mandrell bent ?
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post #12 of 42 (permalink) Old 08-03-2005, 12:22 AM
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sweet!
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post #13 of 42 (permalink) Old 08-03-2005, 05:12 AM
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Quote:
Originally Posted by Holy Jerex212
are those crimped pipes or mandrell bent ?
Obviously standard bends - not mandrel ...
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post #14 of 42 (permalink) Old 08-04-2005, 10:13 AM Thread Starter
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Oh, and before someone else catches my mistake...the car is a 2000 R/T not 2001. F***in' typo...

BTW, compared to a test drive of a 2004 Pontiac GP GTP (Comp G) which gets sticker hp around 260, the 'Trep "feels" like it's pulling harder that that with the dual exhaust.

Also, I asked around and it doesn't seem that with my current set-up that an x- or h-pipe is necessary. Gonna call the shop right now.

Last edited by JVH1982; 08-04-2005 at 10:20 AM.
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post #15 of 42 (permalink) Old 08-04-2005, 05:15 PM
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Quote:
Originally Posted by JVH1982
Also, I asked around and it doesn't seem that with my current set-up that an x- or h-pipe is necessary. Gonna call the shop right now.


But then again - I'm used to Old Muscle ...
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