least restrictive??
Thread Starter
Instructor
Joined: Feb 2011
Posts: 136
Likes: 1
From: Florence Mississippi
least restrictive??
Having to replace cats on 1996 LT1. Trying to decide between flow master hi flow and magnaflow hi flow. Does anyone know which would be better? I have searched for specs on both but haven't found any information. Also will be replacing exhaust with either OBX or Allens chambered exhaust. Any info and opinions will be really appreciated.
THANKS TO ALL
THANKS TO ALL
Team Owner
Joined: Oct 2004
Posts: 81,241
Likes: 3,062
From: altered state
St. Jude Donor '05
interesting the old 40 series flows are a little more than 1/2 of the ultraflow
OP a straight through muff will have the least amount.
Personal choice. Although they look abtou the same inside i Hate the way magnaflows sound. Like a boat..or a RAm truck
Ultraflows esp with some overlap and a tight lsa on WOT my god there is nothing sweeter youll want to romp on it over and over and over.
Ovals a little quieter and high pitched than the welded. Kick azz pieces.
OP a straight through muff will have the least amount.
Personal choice. Although they look abtou the same inside i Hate the way magnaflows sound. Like a boat..or a RAm truck
Ultraflows esp with some overlap and a tight lsa on WOT my god there is nothing sweeter youll want to romp on it over and over and over.
Ovals a little quieter and high pitched than the welded. Kick azz pieces.
Team Owner
Joined: Aug 2004
Posts: 21,543
Likes: 3,216
From: Park City Utah
Team Owner
Joined: Aug 2004
Posts: 21,543
Likes: 3,216
From: Park City Utah
A 350 what....engine? What state of modification? Need more info.
Don't need a chart for though: 350CID/2 (b/c it's a 4 stroke)=175 * RPM (let's use 5000)= 875,000/1728 (to convert CID to Cu Ft)= 506.3 CFM. But wait, that is 100% VE which most of us don't reach. So, 506*(VE).8= 405CFM. The exhaust only needs to be ~70% of the intake, so 405 * .7 = 283 CFM...let's say 300 CFM.
.
Don't need a chart for though: 350CID/2 (b/c it's a 4 stroke)=175 * RPM (let's use 5000)= 875,000/1728 (to convert CID to Cu Ft)= 506.3 CFM. But wait, that is 100% VE which most of us don't reach. So, 506*(VE).8= 405CFM. The exhaust only needs to be ~70% of the intake, so 405 * .7 = 283 CFM...let's say 300 CFM.
.
Last edited by Tom400CFI; Jan 31, 2017 at 05:02 PM.
Burning Brakes
Joined: Nov 2016
Posts: 761
Likes: 79
From: Buchanan GA
A 350 what....engine? What state of modification? Need more info.
Don't need a chart for though: 350CID/2 (b/c it's a 4 stroke)=175 * RPM (let's use 5000)= 875,000/1728 (to convert CID to Cu Ft)= 506.3 CFM. But wait, that is 100% VE which most of us don't reach. So, 506*(VE).8= 405CFM. The exhaust only needs to be ~70% of the intake, so 405 * .7 = 283 CFM...let's say 300 CFM.
.
Don't need a chart for though: 350CID/2 (b/c it's a 4 stroke)=175 * RPM (let's use 5000)= 875,000/1728 (to convert CID to Cu Ft)= 506.3 CFM. But wait, that is 100% VE which most of us don't reach. So, 506*(VE).8= 405CFM. The exhaust only needs to be ~70% of the intake, so 405 * .7 = 283 CFM...let's say 300 CFM.
.
stupid question, but what does VE stand for?
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Team Owner
Joined: Aug 2004
Posts: 21,543
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From: Park City Utah
Yes and yes. That is why modding an engine helps; you're improving the pumping efficiency of the engine. Same size engine, but it makes more power. How? More air in, more cylinder pressure, more exhaust out.
Burning Brakes
Joined: Nov 2016
Posts: 761
Likes: 79
From: Buchanan GA
So, based on the chart, having two stock mufflers rated at 252 CFM would provide no restrictions to the exhaust flow? I would guess these ratings were made at a certain static pressure.
I wonder if the manifolds have any numbers associated for flow rates? One of the few mods I was considering for performance was a set of headers. I would be curious as to the flow rates of each brand and at what point they reach the rate of diminishing returns.
I wonder if the manifolds have any numbers associated for flow rates? One of the few mods I was considering for performance was a set of headers. I would be curious as to the flow rates of each brand and at what point they reach the rate of diminishing returns.
Former Vendor
Joined: Jan 2015
Posts: 412
Likes: 64
Hi Craneman, we offer a few 49-state legal cat replacement options that are much more affordable than OE units. Our universal cats (#99006HM) can be welded on by your local exhaust shop, and our direct fit cats (#23408 and 23409) replace the entire section of piping so no modification is required.
If you were looking for more sound from your exhaust, we also offer a Street axleback #15623 that will bring the deep muscle car sound out of your Corvette.
http://www.magnaflow.com/products?partNumber=15623
If you have questions about any of these products, drop us a PM anytime!
If you were looking for more sound from your exhaust, we also offer a Street axleback #15623 that will bring the deep muscle car sound out of your Corvette.
http://www.magnaflow.com/products?partNumber=15623
If you have questions about any of these products, drop us a PM anytime!
Last edited by Magna_Flow; Feb 2, 2017 at 02:14 PM.