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Discussion Starter · #1 · (Edited)
Hi Everyone,

We Have been working with Kooks to develop a Header package for the SRT8 6.1 and the 5.7

This has been quite the hot topic, so we have 2 SRT 8's currently as GSM Test Vehicles and a SRT Charger coming (D1 Status).

We had the one of the first sets, the problem was we had installed them as soon as we got our hot little hands on them and we worked with magnaflow to make the custom 3" mid pipes with the ultra high flow metallic cats

Everyone has seen the 300c Supercharged and it was kinda hard to go backwards on that vehicle to do an accurate test so we lined up the bone stock Magnum SRT8(1510 mi) and did a dyno run for a base line

1ST Run is no mods at all dead stock .

2ND Run is the addition of the Kook's 1.7/8" primiary headers only,
stock exhaust.

As we were test driving the Magnum we felt the power difference right away and the dyno numbers confirmed a nice gain in torque and horse power and the 2nd run has better numbers from start to finish, not just a little here or there. We will be dynoing the addition of the Magnaflow exhaust in the morning to see what is left on the table vs the stock exhaust.

We wanted to get numbers on the 6.1 without a blower of course, now that being said the addition of a Supercharger will only benifit more with the added flow. I think the debate on the primary size is now a Dead issue with the gains seen on the 1.7/8" primary design.

See Attached dyno graphs 26.6 rwhp and 36.1 lbs of TQ

Scott
GS Motorsports
888-GSM-HEMI
 

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The Torque gains are particularly impressive.

While I would have liked to see a 1 3/4" primary result to compare, the results are so good with 1 7/8" that 1 3/4" should no longer carry significant weight in a buying decision.

Now a Kook's header plus a free flowing exhaust equals ?? HP/Torque gain?
A dyno chart of that combination should open many eyes.

Zilla
 

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Impressive!

I have a 300C SRT-8 next week and will be running the same testing. Numbers seem on par ... from what I have seen in the differences between the Magnum and 300C SRT-8s I think a header back exhaust will be breaking the 400 rwhp barrier fairly quickly.

And Goddardzilla ... oh never mind ... I wait to post up my own numbers :p (I think someone leaked some info about the 1 3/4 LTs ...) :biggrin:
 

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26 rwhp?????holy sheeit!! i can't wait to see what you get with the magnaflows.....

very well done I must say...........I figured maybe about 15-- 20hp, but 26 is really good....definately makes the mod worth the money now.......
 

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I'm VERY impressed! I can't wait to see your results with the Magnaflow. If we can see 400 RWHP with nothing but exhaust mods, I think everyone will be in the market.
 

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Scott,

Thank you for the info. You will be hearing from me next week.

Are you going to stick the Magnaflow cat back on the Magnum and redyno? I would like to see those results, too, just to see if the header + cat back are additive or one mod is doing more than the other.

Todd
 

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whitediamond just let us know when you are ready to order
 

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There they are

I would just like to say thanks to eveyone that was patient and was waiting for the numbers well here they are. We have 50 sets in stock witing to ship Thanks again GS for the numbers. :banana: :banana:
 

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So, the car with the kooks on them, has a 3" high flow cat on it as well, + the stock exhaust ? If that's the case, we all know that just moving to a high flow cat will give 9 rwhp by itself ..... Magnaflow dyno'd them too .... or, is it the kooks, connecting to the factory catalytic converters and stock exhaust ?

Also have to keep in mind that as we have seen many dynos of many cars, they all vary from car to car 6-10 rwhp ... so technically, the bone stock Magnum that was tested, could have been one of the lower RWHP winners ... making the gains a little harder to assume .... and the one with the kooks installed could have been 10rwhp higher from the beginning, not making the gain so dramatic .....
 

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need4speed said:
Also have to keep in mind that as we have seen many dynos of many cars, they all vary from car to car 6-10 rwhp ... so technically, the bone stock Magnum that was tested, could have been one of the lower RWHP winners ... making the gains a little harder to assume .... and the one with the kooks installed could have been 10rwhp higher from the beginning, not making the gain so dramatic .....
The stock numbers for their MSRT-8 are 3rwhp and 6rwtq lower than my stock MSRT-8. The torque number is actually the lowest I have seen yet, as all the dynos(stock) I have seen have the torque equal too or just a tad higher than HP. Either way, the numbers are very close and the results are very realistic in my opinion.

I would also like to know about the high flow cats on this set-up since Scott says Kooks Headers only and doesn't mention the cats. Hopefully Scott can clarify this for us.

Todd

Edit: Scott just returned my PM and stated the high flow cats and mid-pipes where part on this install. There is no way to use stock cats with these headers.
 

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how are you todd
Great and looking foward to your headers on another 'supercar' that just came out. I saw your post on one of your customers taking delivery and I am anxiously waiting to see your 1 7/8" primaries on that 427ci monster. I will order a set of SRT-8 headers from GSM later this week. The low end gains are nice and enough for me to pass on waiting for 1 3/4" results.

Todd
 

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WhiteDiamond said:
The stock numbers for their MSRT-8 are 3rwhp and 6rwtq lower than my stock MSRT-8. The torque number is actually the lowest I have seen yet, as all the dynos(stock) I have seen have the torque equal too or just a tad higher than HP. Either way, the numbers are very close and the results are very realistic in my opinion.

I would also like to know about the high flow cats on this set-up since Scott says Kooks Headers only and doesn't mention the cats. Hopefully Scott can clarify this for us.

Todd

Edit: Scott just returned my PM and stated the high flow cats and mid-pipes where part on this install. There is no way to use stock cats with these headers.
Good point. I'm wondering how much of the gains are attributed to the hi-flow cats.
 

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300degree said:
Good point. I'm wondering how much of the gains are attributed to the hi-flow cats.
There is a thread in here on these. It was something like 5-6rwhp/6rwtq average across the board and 9rwhp at peak and 10rwtq at peak, or close to it. I didn't dig up the thread to check, but those numbers are close. Those numbers came from a 300C SRT-8 with a Magnaflow cat back in place.

Todd
 

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Ok, I misunderstood the explanation of two magnums etc....

So, the Kooks includes a high flow cat setup, that will connect to our magnaflows or a stock "cat-back" ?

If you knock 8-9 rwhp off that number, that should be closer to the real gain, which in my book is still fairly impressive .....

What is the going rate for them ? What is included exactly ?
 

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Discussion Starter · #20 ·
The 6.1 Header system includes ,


Long Tube headers, gaskets, bolts, 3" Mid pipes w/Metallic cats that will connect to a magnaflow Cat back or Borla ect ect...

We highly recommend that people order the headers Cerma Chromed, This is a high temp coating that keeps the heat in the pipes and is very benifical on the LX Triplettes platform(charger,magnum,300)


Scott Quaranta
www.GSMotorsports.com
888-GSM-HEMI
 
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