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Discussion Starter · #1 ·
400 rwhp ... so close but then again 397 is not so bad :)

MAGNAFLOW 3" HIGH FLOW CATALYST #16420


MAGNAFLOW 3" CAT-BACK p/n 16642 / 3" HIGH FLOW CATALYST p/n 16420


Here are the numbers you have been waiting for:



Stock Baseline: 377 rwhp / 378 lb-ft
MagnaFlow 3" High Flow Cats: 386 rwhp / 389 lb-ft
MagnaFlow 3" High Flow Cats / 3" Cat-Back: 397 rwhp / 400 lb-ft

MAX HP gain: 24 @ 5300 rpm
MAX TQ gain: 25 @ 4700 rpm

PEAK HP gain: 20
PEAK TQ gain: 22

Our Cat-Backs tend to produce 11-15 rwhp (conservatively with others seeing up to 20) and the MagnaFlow High Flow Cats produce another 7-8 rwhp on their own. The combination nets 20 SOLID rwhp and across the entire curve. I'm sure additoional testing would have netted a 400 RWHP number but what is 2.2 rwhp :)

Thanks again to Chris (Cbutler32) for dropping by to have us faciliate the install and dyno. He was more than patient while we worked on our next TV appearance filming here at the MagnaFlow Tech Center but hopefully he was entertained while getting to observe the entire installation and testing. From the smile on his face when he was here I'm sure he's enjoying the ride home.
 

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do the high flow CATS fit the 5.7 300c, orare they only for the srt8?
are the CATS CARB approve? would they through a CEL?
 

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Richard,

Those are great numbers!!

Todd

PS: Want to build us a 3" X-pipe to fit that narrow pipe seperation of the LX cars?? I want one.
 

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Discussion Starter · #4 · (Edited)
alik2b said:
do the high flow CATS fit the 5.7 300c, orare they only for the srt8?
are the CATS CARB approve? would they through a CEL?
These are 6.1L specific .. the 5.7L application will follow shortly Jan 2006.

Carb is pending and so far no CEL.
 

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Richard...

Thanks again to Chris (Cbutler32) for dropping by to have us faciliate the install and dyno. He was more than patient while we worked on our next TV appearance filming here at the MagnaFlow Tech Center but hopefully he was entertained while getting to observe the entire installation and testing. From the smile on his face when he was here I'm sure he's enjoying the ride home.

It is still like this... :biggrin: :biggrin: :biggrin: :biggrin: :biggrin:

Thanks!
It was worth the wait - trust me!!!
And I might need to find a bro who can hook me up on tires after seeing the little amount of rubber left on the rears at 8800 miles... :bigeyes2:
holy smokes!!!
As they are really starting to "slide" all the way through first now - :wink1:
And I have no problem coming back when we have time to get that elusive number of 400 RWHP - :wink1:
Once again, THANKS!
Sincerely,
 

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squinn...

funny you should mention that...
the demand has been very light on this item...
probably because everyone has been waiting for these numbers to be posted...
so now they are available and once the demand is there from everyone here...
then the supporting vendors will buy them and make them available at a price they set and as for a group buy that would be up to the supporting vendors as well...
I know once everyone see's the gains...
this is a no brainer...
and if you have the magnaflow cat-back exhaust...
you really outta get the high flow cats...
if the demand is there on this expect a Jan. time frame...
 

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can someone please explain to me....right now i have the magnaflow system,and what i dont understand is --MagnaFlow 3" High Flow Cats: 386 rwhp / 389 lb-ftMagnaFlow 3" High Flow Cats / 3" Cat-Back: 397 rwhp / 400 lb-ft--...are you saying that i have around 386 rwhp right now,and if i buy the high flow cats ill end up with 397 or so?is this with or without new headers?and if with out,..then if i read correctly in another post itll add 7 to 10 rwhp with new headers>?so total with headers and magnaflow all the way back you should be 410 rwhp or so?..juss so much different stuff to keep track of..pls help me understand...iam a lil slooow..lol
 

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It is worth noting that Chris's car is very healthy on the baseline test. That is probably from Chris's extensive use of the loud pedal as the PCMs do adapt to your driving a bit. Good job Chris!!!

One thing, just a little knock on the results, the 397rwhp number is from that nice little spike just before 6K rpm. What is the RWHP number before that spike?

All cars respond to dyno's differently. My Magnum SRT8, for example, on that exact same dyno did over 10rwhp less on the baseline(stock) pull than Chris's car. My car was much lower milage at that time and I hadn't had time to really drive it, but it shows how different numbers can be vehicle to vehicle and mod for mod. If you note my sig you will see that my post Magnaflow cat back numbers put my Magnum SRT8 about just a tad higher than Chris's 'stock' baseline pull.

Todd
 

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hey guys...

4herb2trasotik - ok, I'll try a stab at it also...
stock car with no exhaust upgrades... 377.42 RWHP
add the 3" High Flow Cats upgrade - 386.67 RWHP
a +9.25 gain in RWHP
add the production cat-back exhaust system and combine the 3" high flow cats... 397.38 RWHP
a +19.96 gain in RWHP

So that equates to a +10.71 RWHP gain on the Magnaflow cat-back exhaust system as an upgrade alone...

I know , I know , I know...
the dyno's are totally different forthe magnaflow cat-back exhaust system and have a greater gain than the +10.71...
but we ran it today 3 times and the 397.38 was with both systems on the car...

whitediamond is right on the mileage thing as we were dyno'ed at the same place...
my HP went up to 377.42 base from 374.53 with another 5,000 miles on her...
his magnum would probably run higher now if he ran it...

Hope this helps...
and doesn't confuse more...
if it does or if I am wrong...
have btlfed1500 chime in...
 

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Is #16420 shipping now? how much?
 

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freakyshiat...
no it is not...
yet...
the vendors have to start ordering them...
the price should be around $450.00 at msrp...
but with group buys and interest...
who knows...
 

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I'll buy that at a Christmas Group Buy price, BUT it's got to be one of those Once a Year deals. I don't want to see a cheaper price in 3-6 months from now... Spending money at Christmas on stuff like this should involve a massively discounted incentive to seed the market with a bunch of braggarts who will motivate the rest to spend some money later on. :biggrin:
 

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thanks for the reply. With these numbers, are headers really worth the price?
 

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freakyshiat...

well I am not the candidate to be the guinea pig for the headers for Kooks...
But I know someone who is and who will have their car at Magnaflow next week...
btlfed1500 (richard) will pull off the cat-back exhaust that is currently on the car now and run it with the header only and a stock exhaust I believe then run the header with the magnaflow cat-back system...
and hopefully run it with the the high flow cats as well...
so we will see in a week or so...
maybe it is a good upgrade...
maybe it is not...
we'll just have to see...
heck it took 3 months to get the numbers we put up today from when we thought we were going to do it...
so we'll see soon...
 

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Just out of curiosity... What was the ambient temp and barametric pressure at? Also was wondering if you ahve ever pulled the battery cable on your car Chris. If so when and at what mileage. I am thinking of resetting mine and driving like a lead footed gorilla for a while to learn this baby back up to where I think it was when I drove it off the lot, which I think was around 370 rwhp. My recent dyno of 385, just seems weaker than it should be. I am thinking the Hogh Flow cats will get this think up to around the numbers you are putting down.
 

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hey chris, thanx man for taking the time to clear it up for me...so ive come to the decision to add the high flow cats it makes good sense to open her up all theway back..still havent decided on the headers i coulda swore i read it only added 5 or so rwhp gain...?but ill wait for a few more posts on that one...$1500 for the headers and $800 to install thats a pretty penny, to me anyway..
 

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Discussion Starter · #19 ·
cbutler32 said:
4herb2trasotik - ok, I'll try a stab at it also...

So that equates to a +10.71 RWHP gain on the Magnaflow cat-back exhaust system as an upgrade alone...

I know , I know , I know...
the dyno's are totally different forthe magnaflow cat-back exhaust system and have a greater gain than the +10.71...

Hope this helps...
and doesn't confuse more...
if it does or if I am wrong...
have btlfed1500 chime in...
I tired to touch on cumulative exhaust gains but will reiterate the significance here...

As you add more components to your Mod List they each become less "effective" in changing the net gains number. This is a function of diminishing returns ...

-Lets say you have a 100% stock car ... it makes 300 [email protected] peak
-You add a cat-back with all other parts remaining the same and you get 10 rwhp @ peak (the power is a function of a 50% reduction in back pressure)
-Now you put the STOCK CAT-BACK back on and install the high flow catalyst system with the stock cat-back and you see 5 rwhp @ peak(the power is a function of a 20% reduction in back pressure and better scavenging)

NOW you put both mods on at the same time and you net 13 rwhp @ peak

Why not 15 rwhp? You have to remeber that each part of the exhaust system does not effect the motor independantly. As i have stated, we know that the power is a function of reduced backpressure and better scavenging BUT how each part effects the system is not cumulative.
On the stock cat the cat-back reduced back pressure 50% but once the high flow cats were put in place the additional 20% reduction is not seen as now the pressure of the system is already much lower due to the addition of the cat-back. Realistically the TOTAL system back pressure may now be reduced by about 60-65% and not the 70% (50+20 from each individual part)

As we have always shown the MagnaFlow part on this dyno (this is an important fact) makes 11-15 rwhp and the cats showed 8-9 rwhp. The low expectation is 19 and the high is 24 ... being that Chris' car runs very strong the expectation would have been the cumulative high number but it dynoed 20 not 24 ... but as i illustrated ... the gains are not additive.

I hope this sheds some light on the issue ... I strongly feel headers and matching high flow cats will compliment the exhaust even more than the high flow cats and cat-back. It would be he next logical step to optimize the system completely.

The car I will be working on next week will be a stock 300c srt8 with our MagnaFlow cat-back and the Kook's LT headers and mid pipes. Nitrous will be the power adder of choice for this car by Christmas.The entire Header back exhaust will defeinately help the added 100-120 rwhp nitrous shot push through the exhaust.

We will see
 

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Does your muffler act as an X-pipe, or is it chambered seperately?

Also, there are several companies selling high flow cats. Has anyone tried them, or is this a CARB issue with the Magnaflow system? I had thought about buying the Cat-Back and adding some high flow cats from Random Technology.
 
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