GMC Truck Forum banner

1 - 16 of 16 Posts

·
Registered
Joined
·
48 Posts
Discussion Starter #1
i'm thinking about getting true duals on my truck sometime soon. i was wondering who else had this done and how much do you like it. Also, what kind of mufflers did you use and what kind of sound increase was there. i'm gonna put to flowmaster 40's with turndowns right past the cab. if anyone has any other suggestions on a nice deep growling exhaust, let me know.
 

·
Registered
Joined
·
113 Posts
I was thinking of getting true duals on my 04 scsb 5.3, but I was told it might make it sound louder but I will lose to much back pressure an it will accually cause the truck to performe worse than it did with the stock muffler setup. So beware of that if you are thinking of getting it dualed.
 

·
Registered
Joined
·
48 Posts
Discussion Starter #7
yeah, i'd heard that i could lose a bit of performance and gas milage if i do it. but i've also had people who did do it to their trucks tell me that they didnt notice a change at all with performance and their gas milage just barely dropped. so i guess its kind of a toss up. i'll probably end up getting it done anyway. i'm getting about 420 miles out of a tank of gas so if it goes a little bit it wont really be that big of a loss. as far as performance goes im not gonna be racing it i'm really more concerned with the look and the sound.
 

·
samcarol
Joined
·
3,596 Posts
repipe your truck :read: go to like a 2 inch pipe, it should help some
 

·
Registered
Joined
·
1,895 Posts
KOEHRSENLB said:
yeah true duals are great for high rpm stuff(youll gain performance there with the right mufflers), but you lose low-end torque with the backpressure drop. or you might be like me and baby the throttle everywhere but the tollway and it might be something to consider
You kids crack me up. :LOL:

If you have mufflers on the truck, and run pipe smaller than 3" diameter, you will not have a back pressure problem. :read: Unless you run huge pipe, you will not lose any lowend. Many people think "bigger is better," and they run much bigger pipe than necesary; then they start complaining that they lost all of their low-end. If the dual system is designed properly, it will outperform a single pipe sytem every time.

I have no idea what motor you're running, so it's hard to tell you what size pipe to run.
 

·
Back from hiatus..
Joined
·
600 Posts
91_bowtie, i have an o3 that i am going to do true dual with some flows---remove fuel tank, put fuel cell where spare tire was. it is a 4.8l and i am going to put a kenne bell s/c on it. i was thinking of going with 2 5/8 inch maybe 3, but i thought 3 might be overkill.
 

·
Registered
Joined
·
169 Posts
deve8edsilv said:
91_bowtie, i have an o3 that i am going to do true dual with some flows---remove fuel tank, put fuel cell where spare tire was. it is a 4.8l and i am going to put a kenne bell s/c on it. i was thinking of going with 2 5/8 inch maybe 3, but i thought 3 might be overkill.
With that 4.8, even with the sc, I would go no more than 2 1/2. 3 inch will kill any low end that the 4.8 might have. Just my .02
 

·
Registered
Joined
·
48 Posts
Discussion Starter #13
yeah, i have the 5.3li in my truck. and like i said im more concerned with sound quality than preformance. if i lose a few horsepower its no big deal, im going for looks
 

·
samcarol
Joined
·
3,596 Posts
91_bowtie said:
You kids crack me up. :LOL:

If you have mufflers on the truck, and run pipe smaller than 3" diameter, you will not have a back pressure problem. :read: Unless you run huge pipe, you will not lose any lowend. Many people think "bigger is better," and they run much bigger pipe than necesary; then they start complaining that they lost all of their low-end. If the dual system is designed properly, it will outperform a single pipe sytem every time.

I have no idea what motor you're running, so it's hard to tell you what size pipe to run.
ever seen a civic with 4 inch pipes? its slower than too days :LOL:
 

·
Registered
Joined
·
342 Posts
I got a 5.3 that i just cut the cats off of and ran true duels with flow master 40 series. originally i just had a single flow and its a night and day difference. I ran 2.5 inch, anything else is overkill. I noticed no change in gas milage, and felt like i had more power mid to uppper rpms, but not a ton. Def real loud, sounds like a muscle car. I like it. :read:
 

·
Registered
Joined
·
48 Posts
Discussion Starter #16
awesome man, thats what i wanted to hear. only thing i either gotta leave my cats or just run another pipe through them so it looks like they're still their. cops are bad around here about loud cars and if they look to see if i have cats and they're not there its a bigass fine that i dont wanna pay. so i'll probably just leave them in. i used to just unbolt my mufler from the Y pipe and run stright exhaust minifold and it's definently too loud. you cant even drive 70mph down the road without it resonating back in the cab. you cant even hear yourself think. but on the plus side it does sound like a freight train coming down the road. :ninja:
 
1 - 16 of 16 Posts
Top