Welp,I made the wrong choice,just had a magnaflo 5x8 24" duel 3" in single 3" out.******* LOAD,sounds like short glass packs dumped with no cats.So I have no doubt this one wont stay on.I should have gone with my first gut instinct which was the bigger 5x11x22,I guess it has much more drone control.Man i hate wasting money.I dont want to add aids to it,plus there is no room since it's dual 3"pipe going in.

 

Gonzo:

-----Original Message-----
From: DGonz9999@aol.com [mailtoGonz9999@aol.com]
Sent: Friday, January 23, 2004 11:00 AM
To: rwaitas@magnaflow.com
Subject: Re:


I sent you 2 emails this was the first i think. Here is a copy of the second one.


I didnt think you would mind responding to a magnaflow question.I have used several magnaflows in the past and I am looking to do something again.I will copy and past my sig from the Ls1 tech board.
2K 1/2 ton xcab 4x4 GMC 6.0 swap stage 1 6.0 heads .020 off,comp 212/218 522/529 114Lc longtubes,HD cats,HD exhaust grafted in,UPD,Ed Wright
I have dual 3" going in,what muffler are you using on the hummer? or the escalade?
Of these magnaflow PN do you have a recommendation?
12763
12762
12599
12398
12590
I am after flow and not noise or drone. Please advise.Thanks Gonzo 6.0

**** If I read this correctly you weer looking for "FLOW AND NOT NOISE OR DRONE"

I made my recommendation based upon your criteria of flow
this was my response:

12398 3" / dual 3" (internal perforated X) 5x8x24

12763 3" / dual 2.5" 7x7x24
12762 3" / dual 2.5" 7x7x30

12590 3" / dual 3" 5x11x22

12599 dual 3" / dual 3" (internal perforated X) 5x11x22

From what I can tell it seems you are going to be working with a 330-350 RWHP combo.

Are you looking to do dual in / single out, true duals or whatever works best?

I would stick with a dual 3" inlet muffler with at least a single 4" or dual 3" outlet for best flow. A dual 2.5" will flow the cfm however if noise is not an issue the 3"s will give you room to grow. I prefer the 5x8x24 with perforated internal x because it saves mass and space. I also prefer the sound/tone of this muffler with 6.0L and larger applications. The 5x11x22's are more for resonance control, but are much more bulky.



Richard Waitas
Engineering / Product Development Manager
MAGNAFLOW Performance Exhaust / CAR SOUND Exhaust Systems
Main: 1-800-990-0905 x 3309 Direct: 949-858-8121 Fax: 949-459-0452
23201 Antonio Parkway Rancho Santa Margarita, CA 92688
rwaitas@magnaflow.com


I believe I gave you the information to make your own decision and I really hope you were not bashing my recommendations based upon your decision.

 

Like it says,i am after flow not drone or noise.Look,I take full responsibility for the decision,my gut told me to go with the largest case possible,and i should have known better since all magnaflow catback systems with 6.0 or 8.1s use the largest case.This muffler i have would be fine on a GEN2 truck but the GEN 3 motors just have a resonence they devlope all to themselves.The engineer at corsa even said to go with the largest magnaflow since he doesnt offer seperate mufflers.OXI.Anyone asking you for a recommendation is putting you in a bad spot i know,everyone has a differnet idea of what sounds loud or drones or has enough tone.Maybe i looked at you response all wrong,i thought you were recommending the smaller cased muffler over the larger.although i dont think the bigger magna flow will flow less CFM than the one i had installed