| From | Message |
CThomp
*GenIII*
11/20/2003
10:43:30
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 Subject: Need Feedback on Exhaust Idea
IP: Logged
Message:
Alright I need some feedback on this:
Custom y-pipe to replace stock one
leading to 3" Carsound Cat
leading to 3" Mandrel bent SS
Exiting through 3" Supertrapp muffler before passenger side rear wheel.
Should I go with 3" or stick with 2.5". What size y-pipe should I have made? I'm thinking about supertrapp because I'm going for something original here.
Current mods
68mm Fastmn TB
4"z-tube
2.5" Carsound Cat
2.5" in/out Magnaflow
180t-stat
Future mods
Maybe 72mm TB
Probably HO cams and Intake unless better ones come along
Maybe long-tube headers if they can be routed to stock exit.
Hurst shifter.
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FLDak
Dodge Dakota
JOIN HERE
11/20/2003
12:13:15
|  RE: Need Feedback on Exhaust Idea
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Message:
CThomp;
I recently bought me a Flowmaster 'Y' pipe off of ebay. It is dual 2.25" into a single 3" pipe. My plan is to have the muffler shop cut off the pipes just after the pre-cats and bend me some 2.25" pipes and route them just like the GSMotosport system into my new 'Y' pipe just before my currently existing Flowmaster 70 series muffler.
I think the 3" all the way like you want to do may be to big unless you are going forced induction. I'm not so I'm going with the 2.25" into a single 3" into the muffler and 2.5" duals out the back.
Does this help you any or am I just ramblin here?
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CThomp
*GenIII*
11/20/2003
12:22:21
| RE: Need Feedback on Exhaust Idea
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Message:
I'm trying to avoid duals though. I've always been fond of a single pipe. Plus the single pipe set up is supposed to flow better than a dual setup. I'm just trying to find the right single combination. The gsmotorsports dual exhaust is very impressive though. 14rwhp is hard to beat.
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midnightmagic
GenIII
11/20/2003
12:41:59
| RE: Need Feedback on Exhaust Idea
IP: Logged
Message:
id go with a magnaflow muffler but thats just me! i have 2.5" from the y pipe back into a single in dual out magnaflow and thats about as big as i will go till i go FI. 3" all the way back is too much unless your puttin close to 300hp at the wheels. good rule of thumb 300hp or less 2.25 to 2.5 and over 300hp no less than 2.5 and 3" a set of shorty headers into 2.5" will do great for a "all motor" setup. a dakota with a crate 380hp 360 engine with headers and 2.5" duals will make about 320rwhp(auto tranny) and a little higher on 5-speeds. hope this helps!
You gotta ask yourself one question...That Thing Got A HEMI???
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FLDak
Dodge Dakota
JOIN HERE
11/20/2003
12:48:24
| RE: Need Feedback on Exhaust Idea
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Message:
CThomp;
Are you going to keep the pre-cats?
Midnight;
Do you still have your pre-cats?
I'm just wondering how restrictive the pre-cats are? Is it worth the trouble to get rid of them?
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CThomp
*GenIII*
11/20/2003
12:55:27
| RE: Need Feedback on Exhaust Idea
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Message:
I have no pre-cats. I bought my dak in Winter of '00
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FLDak
Dodge Dakota
JOIN HERE
11/20/2003
13:03:35
| RE: Need Feedback on Exhaust Idea
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Message:
CThomp;
Your lucky!!
I'll probably leave mine on, I've read a few threads were on the '02 models w/pre-cats the catboxs didn't work for very long.
Hopefully I'll get my exhaust work completed in a week or two.
Good luck to you, keep us informed about what you do and how it comes out!
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CThomp
*GenIII*
11/20/2003
13:07:40
| RE: Need Feedback on Exhaust Idea
IP: Logged
Message:
I'm concerned about the sound as well. I may have to run duals just because of the horsepower figures on the mufflers. That meaning how much power each individual muffler can take. This is gonna take more reseach.
I guess I could order the gsmotorsports exhaust with out the mufflers. Meaning the cats to just after the x-pipe. Then I could put what ever mufflers I wish on it. I'm gonna have to shoot gsmotorsports an email.
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midnightmagic
GenIII
11/20/2003
13:23:13
| RE: Need Feedback on Exhaust Idea
IP: Logged
Message:
i dont have the third cat the one after the ypipe, i had it cut off! i actually did better in my emissions test without it on! also the magnaflow will handle your motor with a supercharger and nitrous so i don't think you have to worry about that unless you plan on puttin in a 426 hemi with a blower on it! the magnaflow is straight thru and has a nice rumble at idle and quieter than the flowmaster at speed but under WOT its like unleashing a banshee really nice kick yo azz sound!!!
You gotta ask yourself one question...That Thing Got A HEMI???
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CThomp
*GenIII*
11/20/2003
13:29:57
| RE: Need Feedback on Exhaust Idea
IP: Logged
Message:
I have a mgnaflow right now and like it but i'm interested in trying something new though. Gettin board I guess.
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j
GenIII
11/20/2003
16:26:04
| RE: Need Feedback on Exhaust Idea
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Message:
I think it is worth the trouble to get rid of the precats. The GSMotorsports setup comes with 2 high flow cats.
2000 4.7 CC auto, clear corners, Spintech true duals, Kenne Bell s/c, Aquamist water injection.
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Demon Dakota
DakotaEnthusiast
11/20/2003
16:30:59
| RE: Need Feedback on Exhaust Idea
IP: Logged
Message:
The precats are one of the most restrictive things in our exhaust system. The stock regular cat is actually OK in comparison...our stock Y pipe sucks, though...
True Dual exhaust and removed third cat
HO Cams & HO Intake
FASTMAN 70mm TB
Autolite 3923 Plugs
TPS @ .76 VDC
IAT Adjuster Mod
Custom tranny VB Mod
Demon long tube headers
Ported/polished heads w/ 1.92" Intake/1.60" Exhaust Valves
One dead stock LSD unit (POS...)
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slow r/t man
Dodge Dakota
JOIN HERE
11/20/2003
17:28:36
| RE: Need Feedback on Exhaust Idea
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Message:
Sounds like a good idea, but supertraps sound like crap. Unless youv'e heard one and like it, I sure didn't. 3" single is LOUD
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CThomp
*GenIII*
11/21/2003
07:50:08
| RE: Need Feedback on Exhaust Idea
IP: Logged
Message:
Yeah I did some pretty extensive research last night on the supertrapp idea and came to the conclusion that it was possibly a bad idea because
of the sound.
So for now I guess i'll stick with getting the y-pipe done.
I just ordered a bed rug, bed rail caps, and a tonnoe cover though so it may be a couple of weeks.
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Wadak
Dodge Dakota
JOIN HERE
11/21/2003
23:13:04
| RE: Need Feedback on Exhaust Idea
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Message:
I replaced the stock factory muffler on my 5.2 4x4 with a flowmaster 70 series. The factory muffler was 3" in 2.5" out. The flowmaster is 3" in and 3" out all the to the exhaust. If I was to take a wag at the increase I have to about 10hp increase. It was very noticeable difference, About as much as adding th Jacobs Pro Street Ignition. Jacobs claims 12 rwhp increase based on dyno'ed results.
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