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  #37  
Old 07-30-2010, 11:17 AM
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Re: 5.7 Shorty Headers

What about using the SRT Manifolds? What is the hp/tq increase for headers, on the Hemi, and SRT? I've heard there isn't much of an increase for the SRTs.

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  #38  
Old 10-12-2010, 09:05 AM
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Re: 5.7 Shorty Headers

Bingo.... 09 WK here and I installed a complete srt8 Exhaust with res delete about 2 weeks ago... woke the 5.7 right up and with CAI and 93 predator tune and 180 stat, this bitch runs hard now. Basically, srt8 stock exhaust manifolds ARE shorty headers. Look at them..... I have pics of the complete exhaust side by side I will post soon. The stock exhaust mani folds are pitiful and not designed for performance. The stock exhaust is very restgrictive and the muffler must have weighed 85lbs and about 5 feet long???? crazy.... with speed limiter raised to 155, I ran up to 140 very,very easily and it was still pulling nicely. Top speed is easily over 150 with these minimal bolt ons. Changing the exhaust from the very restrictive stock single to a nice free flowing dual with headers made a huge difference in my jeep. Now I do have an 09 which has the D port exhaust just like the srt8 so it was a perfect match on my heads... TBF
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  #39  
Old 10-12-2010, 09:12 AM
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Re: 5.7 Shorty Headers

TBF, how hard was it to install the headers? Did you have to modify much or did everything bolt right on?
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  #40  
Old 10-12-2010, 10:13 AM
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Re: 5.7 Shorty Headers

If I had an 09 jeep... i would have bought these long ago:

http://cgi.ebay.com/ebaymotors/ws/eB...d=150501257440

same thing as kooks headers, just made overseas, therefore cheaper
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  #41  
Old 10-12-2010, 11:45 AM
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Re: 5.7 Shorty Headers

Install was a bit of a bitch.... pass side exhaust flange did make contact with part of trans bellhousing but a little trim with the reciprocating saw and all was good. bellhousing part was not used so no harm done at all. Driver side I had to whack what appeared to be the left side engine mount for another engine other than the hemi... no harm there either unless you want to convert to the deisel?? the rest just bolted in and the mounting brackets are avail at the dealer. I have the trailer tow pkg so i had room for the chrome exhaust tips out the back. Some of the heat shields may not quite fit properly but it looks fine...... A little drone at about 1,800rpm but it sounds beefy..... especially when you get on it! Black WK Limited with chrome clad wheels and a self added R/T emblem under the HEMI callout on the back hatch keeps the ricer boys a bit confused and not willing too willing to put me to the test! I do have a set of springs from an SRT8 as well that I have not installed yet. The jeep is sitting a bit high in the back now due to the weight of the full size spare that i removed. I am planning on getting a small space saver and keeping it in the back. No more towing for me and off-roading is not my bag.

I also just about sliced the end of my middle finger off on the super sharp head gasket trying to get the driver side header on and finally got it by grabbing it tight and firmly putting it in position.... That damn gasket is very thin and sharp as a knife.... hurt like a motha and I should have had it stitched up but I manned up with a band aid and neosporin and finished the job by myself. Fiance freaked when I rushed into the house with blood all over my hand and said I was crazy to do this stupid car stuff! Maybe she is right, I'm getting too old for this...... I would say that the stock SRT8 headers and exhaust is an optimum setup for a mostly stock 5.7. I am more than pleased with how this engine responded to these bolt on changes... Astounded is more like it! TBF
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  #42  
Old 10-12-2010, 12:03 PM
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Re: 5.7 Shorty Headers

I have a gibson exhaust so now i just need to open up the headers. Do you think just adding the SRT headers would change the sound much? I heard the AR headers really change the exhaust note. Have any 5.7 guys dynod the SRT upgrade?
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  #43  
Old 10-14-2010, 03:42 PM
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Re: 5.7 Shorty Headers

quick pic...
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Old 10-14-2010, 03:51 PM
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Re: 5.7 Shorty Headers

As far as the sound goes, sounds beefy.... stock pipes are 2.75" each and that is what gives the deep tone... resonator delete makes it pretty loud at full throttle but idle is mild but nowhere near as quiet as stock... TBF
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  #45  
Old 11-03-2010, 08:03 PM
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Re: 5.7 Shorty Headers

So the SRT manifolds do or don't fit on a pre-'09 5.7 ?
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  #46  
Old 11-09-2010, 04:26 PM
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Re: 5.7 Shorty Headers

I think they will work just fine but the port opening is larger than the exhaust port window on the pre-09 5.7 heads. I have put many a header on a car that had a much larger pipe than the port so i would say it is not an issue. I have not dynoed my combo but I ran a 14.20 @97mph with a CAI and pred tune. I have no baseline run of a stock 09 Grand cherokee but it runs way harder than it did when stock. Let the hemi breathe and it will make power!! Stock log manifolds are horribly restrictive..... TBF
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Old 12-13-2010, 01:21 PM
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Re: 5.7 Shorty Headers

gibson super truck exhaust

what about magnaflow, or stock systems they seem to be priced about the same?
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  #48  
Old 12-16-2010, 09:17 AM
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How restrictive is the stock cat? how much more do you gain after you eliminate the 100lb muffler and put on a cat back system?
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