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Kelly
Dodge Dakota
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11/30/2003
17:36:19
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 Subject: Gibson size
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Message:
HEllo
Im going to buy a gibson mufller(not the kit)and I was wondering what size in and out I should get and also what size pipes to use. The cat back kit is about 300-400 dollars,but I can get the muffler and take it to a shop for about 200. I have a 98 5.2L. If any one has the cat back kit could you tell me the specs of it . THANKS for the help.
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Kelly
Dodge Dakota
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12/02/2003
02:14:27
|  RE: Gibson size
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Message:
come on some plz help me.
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ScottE
Dodge Dakota
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12/02/2003
06:44:20
| RE: Gibson size
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Message:
The most widely used catback system for modded V8s is the 3" - pipes as well as muffler in/out. However, if this is theonly mod you do, you will likely lose some low end power. The 3" usually works best when the intake end of things has been opened as well (TB, air intake, etc.).
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Guido
Dodge Dakota
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12/02/2003
11:27:51
| RE: Gibson size
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Message:
yea if u only wanna do exhaust and no other mods than stick with a single 2.5" muffler and pipes otherwise go to a 3" if u plan on other mods.
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Kelly
Dodge Dakota
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12/02/2003
22:40:44
|  RE: Gibson size
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Message:
I have a intake already and I was planing to get headers later down the line. Also Idont want it to loud so would you recemend 2.5 or 3. Thanks
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99Dak5.2L4x4
Dodge Dakota
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12/03/2003
10:52:24
| RE: Gibson size
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I got the single sided 3 inch catback system. I should have gotten the 2.5 (stock size) because I noticably lost some low end but noticed some upper end power past 2500 RPMs. The only upgrade I have other than the exhaust is a K&N filter.
So get the 2.5. Gibson gives a nice rumble. Not too loud not to quiet.
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.DOC.
Dodge Dakota
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12/06/2003
12:53:27
| RE: Gibson size
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Message:
Kelly,
The exhaust sound is determined by the muffler, not the pipe size. 3" will improve the flow, but reduce backpressure. This will provide improvement in performance in the mid/upper rpm range.
ScottE is spot on. Plan your mods and do them in a progression that will compliment each other. 3" cat back is good and with AirAid/K&N or equiv. and TB improvement will boost the performance. Consider using a SuperChips hand held programmer, I've found this to be a good combination.
Realize you'll sacrifice low-end performance to benefit mid/upper end rpm performance as you reduce flow restrictions through out your system-especially with header primaries from about 1-5/8" and larger.
Doc
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