What do you guys think?

I'm thinking about cutting up the pacesetter Y pipe before it joins and getting someone to make me a true dual exhaust system out of peices of pipe to avoid getting bent pipe at a shop.
It would most like be dual 3" into an X pipe, with dual 2.5 to the back? And I would buy another cutout to run before the X pipe.

Would I gain anything from this, given my mods. How much louder could I expect it to be?

 

I suspect you'd lose some noticeable low-end torque with the setup you described, which could be significant with the ECSB's weight.

 

I have 3" to 2 1/2 " behind the x as you describe, I gained ~10hp over the stock Y and 3" cat back but then I am probably pumping a bit more air than you.

 

just a bit

I guess I'll just buy Zzebes exhaust off him then.

which he needs to show me pics of asap

 

i didnt notice anything on the lower end but up top it would pull pretty good

 

Anyone on here running dual 3" pipes had better be pushing 600hp or more. Briefly looking at trever1t's setup, I'd say he's matched his exhaust to his power well. Necking down in size as the exhaust route travels rearward is also a smart decision, as it will keep velocity more consistent as the exhaust gas temps cool.

Dual 2.5" is still overkill for most guys. Going from a single 3" to a dual 2.5" is an increase of 39% pipe area for exhaust gas to travel down. Is your motor making 39% more power as well? Hrmmm...300fwhp 5.3L with an additional 39% increase in power puts the motor at a 417fwhp motor. For ***** and giggles, going from a single 3" to a dual 3" means your motor must put out 200% it's stock power output to make use of the dual 3" choice. 300fwhp with an additional 200% increase in power is...well, 600hp. See the wasted pipe here for a stock motor?

 

i wouldnt suggest dual 3 for a 5.3 unless the air is being forced through it..2.5 is the biggest id go on a 5.3 and thats what i had on mine. i have dual 3 on my 370 though..any how i just cant get out my head of dual 2.5 into 3, in my screwed up head it seems like dual 2.5 into dual 1.5, 3/2 is 1.5

 

I said I wanted to do dual 3" into the X pipe, then dual 2.5 out...

 

Bitch Bitch Bitch

I'll send pics in a few

 

right, but even 2.5" duals are decently big for only 325 cubes. 2.25" duals is just a tad larger x-sectional area compared to a 3" single. It just doesn't sound as manly to say 2.25" duals I guess...

Just for a comparison, even though its different generations of small-block, the hopped up 350 in my '66 truck made ~400hp/~415lb-ft torque on an engine dyno. Torque was about 400 lb-ft at 3.5k all the way until about 5k. This was running through 1-5/8" headers with 2.5" collectors, and has 2.5" duals on the truck with an x-pipe.

I could be wrong, but I doubt the engine in your truck is that strong, and you'd have more area under the torque curve in the usable rpm range that you'd be in on a day to day basis with 2.25" dual. But hey, its your truck, so do whatever pulls your trigger.