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rtwhite
Dodge Dakota
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11/15/2004
16:29:59
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 Subject: which spintech?
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I know this has probably been asked before, but which spintech muffler would be the best on my 2000 dakota r/t? I plan on taking out the cat and dumping the exhaust right after the muffler.
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prple-gaseatr
Dodge Dakota
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11/15/2004
17:49:13
| RE: which spintech?
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ditto...
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best?
Dodge Dakota
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11/15/2004
19:50:24
| RE: which spintech?
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define best. loudest? most power gains? quietest?
they're all flow wise, but the loudest spintech street muffler is the pro-street muffler
www.spintechmufflers.com
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rtwhite
Dodge Dakota
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11/16/2004
20:18:19
| RE: which spintech?
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sorry, by best i meant freest flowing, and therefore the loudest. Do you think i could run the pro street without a cat without loosing my low-end?
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good1
Dodge Dakota
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11/16/2004
21:17:35
|  RE: which spintech?
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Backpressure itself doesn't really give or take any low end. But the design of the whole system does. It all comes down to the "siphon tube" effect. When the pipes are matched to the engine output, the gasses flowing through the pipes will "pull" the exhaust out of the cylinders. This applies to headers also. And along with all this, if a system is designed right, it can also begin to "pull" the intake charge into the cylinder for the short time both valves are open.
This is why big tube headers (and exhaust pipes) will usually give the best top end power because it takes a lot of exhaust to fill the pipes and make them siphon. And small tubes give better low end power because they start to siphon earlier, but then restrict the flow at high rpms.
This concept holds true for intakes also, but in the opposite direction.
Hope this helps.
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prple-gaseatr
Dodge Dakota
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11/16/2004
23:14:12
| RE: which spintech?
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i got pph headers on my truck and a dynomax home brewed 3" catback on it now, i want a spintech muffler and i am going to have it exit before the back wheel. i want it louder like a flowmaster 40 series, but i dont want it to sound like one, thats why i want the spintech cause they sound awsome. which one would you guys that have them reccomend for my application?
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good1
Dodge Dakota
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11/17/2004
01:27:47
| RE: which spintech?
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prple-gaseatr:
Before you spend any more money, have you tried just the cat and no muffler? I used to run my '99 R/T this way before I got my PPH's and ditched the cat. I sounded pretty neat. Well, actually, it sounded awesome. Chances are, that with the cat-back system you have now, the exit in the cat is still 2.5" (stock cat). If you want better flow, cut the back of the cat off just enough to make a 3" hole out the back and start a "true" 3" cat back system from there. You can do this safely without damaging the core of the cat, but you might have to do it yourself because muffler shops usually don't like to modify emmissions parts.
Just a suggestion.
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half
Dodge Dakota
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11/19/2004
00:50:37
| RE: which spintech?
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chopping the 3rd cat is a good idea, but no muffler is a bad idea. unless you plan on replacing burnt valves every 10K miles...
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DennisO
Dodge Dakota
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11/19/2004
17:50:27
| RE: which spintech?
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Running no muffler will not burn your valves. Now, if you ran open headers around all the time you might get burnt and/or warped valves. But running no muffler will not cause burnt valves. As long as he still has the cat on -no worries-. Eh.
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Todd Bouton
Dodge Dakota
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11/19/2004
20:35:35
| RE: which spintech?
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On my 01, 4.7, manual, QC, some mods, etc.,
I had the three cat set up stock.
Taking advice from here, I simply had the third cat professionally eliminated, for only $30.
It's noticeably louder, sutle, but definitely louder. It also climbs to 6000-6200 easier with noticable pull there. Yea, I know, big deal since I normally cruise between 1750 and 2250.
My loaded, heavy, slt quad, with the trailer towing pack, heavier everything including alternator, battery, radiator, bumpers, receiver, cab high leer shell, 16inch mags from the tire and handling pack, A 5th real mag spare, etc., gets really good MPG!
How good? on my biweekly trip to San antonio from Houston and back, cruise on from 71-76mph, no significant winds, a/c on, 19-21mpg, hwy. 2wd, 3.55's, LSD, manaul. Thats with several hard accelerations, a few 2nd gear scratches, etc, until on the tollway and interstate.
Anyway, for $30, it sounds great, but still quiet on the HWY.
I'm soon to do custom duals, with a H pipe, from the precats, dualed out to either infront of pass rear wheel, or stock exit. All aluminized, mandrell bent, and custom bends with no 90 degree bends.
NOT a cat back, and NOT out the BACK! A dyno proven personal preference.
BTW- Those Spintechs are pricey, aren't they?
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hoops
Dodge Dakota
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11/20/2004
14:59:56
| RE: which spintech?
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ok that's not correct either. in order to keep enough backpressure, but not too much, you need some kind of muffler and a cat, if you dont have a muffler eventually you WILL burn your valves up, if you dont have a catalytic converter, you will crack your valves from sucking air in at engine shut down.
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HSKR
Dodge Dakota
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11/21/2004
01:40:37
| RE: which spintech?
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LMAO!!!!! cracked valves!!! LMAOO!!!! I know many R/T owners running no cats, myslef included, and havent' cracked a valve yet. That's an old wives tale.
As far as which Spintech to buy, the choice is really up to you. The race mufflers(think flowmaster single chamber) will be the absolute loudest and freest flowing. Persoanlly, the truck/SUV ones sound the best and still offer very free flow. Also, on another note. Unless you want obnoxious loud, don't dump the exhasut right out of the muffler. Not only will it sound bad outside the cab, but the drone inside the cab will drive you nuts or deaf. If you want the exit before the axle, try a side exit exhaust. If you want it dumped under the truck so you don't see a tip, at least take it over the axle and point the tip slightly out from under the truck. This will help with the drone inside the cab.
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joni r do
Dodge Dakota
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11/22/2004
17:53:35
| RE: which spintech?
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what hoops said holds true with smaller engines that dont have a whole lot of back pressure to begin with. but a 5.9 is a larger engine and should do fine without a cat, but dont mark my words. why dont we let HSKR here test his words, he seems pretty sure of himself, either that or he likes laughing at himself.
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intense blue
Dodge Dakota
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11/22/2004
19:27:56
| RE: which spintech?
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If someone would be kind enough to give me a good explanation ad to why no backpressure burns valves and no cat cracks valves then I might believe it. But for now, it all sounds like old wives tales.
Also, what did auto makers do before they had catalytic converters to keep from supposedly "cracking valves"
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