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  #13  
Old 03-27-2013, 01:55 PM
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Re: SRT Exhaust conversion with Dual In - Dual Out Muffler

Fortunately, the faces aren't warped so they won't have to remove much material. Good point about the alignment of the mid pipes if they are slightly narrower. I'm not sure what to do yet if they are off a bit. I'll have to cross that bridge when I get there.

I'm temporarily going to either find a used OEM SRT exhaust or purchase an SRT pre-made catback exhaust so all the flanges will line up at the mid pipes. I figure the exhaust shop can then put the support hangers wherever they need them.

I'm not sure what I'm getting myself into but this should be a fun learning experience. Thanks again for the support. I definitely need it.
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  #14  
Old 03-27-2013, 10:23 PM
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Re: SRT Exhaust conversion with Dual In - Dual Out Muffler

If your motor is completely stock I think your going to get a lot of low end torque loss with the mids and dual exhaust setup.... You will gain with the manifolds... Then lose so much with all that pipe. So you will be doing this for aesthetics and noise. The stock exhaust you have on is spot on when it comes to diameter of the mids and catback for the stock motor....The log manifolds are the problem. I hope you plan on the doing the cam, and save some money and do it yourself. It's not that bad, hardest thing is wiggling the radiator in and out... Other than that its a piece of cake with the right amount of time and tools. What does everyone else think? If he stays stock cam should be go 2.25'' or 2.5'' duals?
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  #15  
Old 03-28-2013, 02:48 PM
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Re: SRT Exhaust conversion with Dual In - Dual Out Muffler

It is completely stock right now. I'd like to get more feedback from others about the loss of low end response. You've got me thinking that until I do the cams and CMR tune maybe I should temporarily add a Y pipe after the SRT mid pipes and do a 2.5" single-in, single-out muffler in the meantime. (???)

I'll be installing an OEM SRT intake tube in place of my stock resonator box this weekend and I have a throttle body that will be ported to 85mm as well.

Any thoughts would be appreciated.
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  #16  
Old 03-28-2013, 03:41 PM
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Re: SRT Exhaust conversion with Dual In - Dual Out Muffler

Your opening up a can of worms with the srt8 mids. They have major hurdles to get them to work. Your cheapest and probably best bet would be to cut the flanges off them, mate them to your current mid pipes and install the srt8 manifolds. Then get a pre made 3'' cat back of your choosing that will bolt right up. You will only be paying the shop for the manifold install and flange weld work. Putting a pre made cat back on is simple. If you wanted to improve your performance a little more cut the stock y pipe out and install the magnaflow dual 2.5'' inlet, single 3'' outlet y pipe and mate that to your stock mids and pre made cat back. This setup would be more than sufficient for most cams, and in the end you will save major money. I know it is a shame to chop up those srt8 mids, but in the end you will have a jeep that runs stronger.... The mids aren't what is holding you back. You would have to pay a metal working shop probably more money than those mids cost you to fabricate special flanges to mate to your srt8 manifolds. Only two people have successfully installed srt8 mids.... Viking and myself.... And I can say that they fit like garbage. I don't like how close they come to the tranny and how low you have to drop the tranny cross member.... It does not make for a lot of confidence driving around with a low cross member and a 1200 degree cat rubbing your tranny pan. The dual exhaust dream on a wk hemi is somewhat of a stretch... Without expensive run flat tires your asking for trouble.
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  #17  
Old 03-28-2013, 03:51 PM
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Re: SRT Exhaust conversion with Dual In - Dual Out Muffler

If your hell bent on duals, here is my future plan. Cut this vertical support section out of your rear bumper support to snake dual pipes out the passenger side. But, my advice is just use a single inlet dual outlet muffler.
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  #18  
Old 03-28-2013, 04:04 PM
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Re: SRT Exhaust conversion with Dual In - Dual Out Muffler

I am going to scrap my srt8 mid pipes at some point and use the flanges to fabricate a set of high flow custom mids... probably 3''... that go into a dual inlet dual outlet flowmaster muffler I already have... But when i do im going to awd dyno and get a custom tune to go along with such a large exhaust. I'm going to cut that vertical section of the bumper support to get the duals out the passenger side. I am opening up a can of worms also because getting two 3'' pipes to clear the tranny support is a stretch also.... My plans are to probably convert the pipes to oval to snake them through. I don't really want to spend another grand on exhaust right now when mine is fine. But with this setup I will have to uninstall for smog testing. I expect to lose low end with oversize mids... But pick up massive top end power. I had jeep srt8 magnaflow mids which are 3'' on for a month right after my cam install... And they really touched tranny pan bad...And my god I have never accelerated so quickly from 35-100mph, it was running into that dual 3'' inlet dual 2.5'' outlet muffler and 2.5'' pipes exiting where the spare is.
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  #19  
Old 03-28-2013, 05:59 PM
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Re: SRT Exhaust conversion with Dual In - Dual Out Muffler

I did this mod 2 years ago to my 09 GC..... excellent bang for the buck considering used srt8 is pretty reasonable. Spare tire needs to go so maybe get a donut size one and put in the back??? My setup had the rear reso's cut out so there is some drone but not too bad. I think mabe the gains will be better using the eagle heads as the exhaust ports are perfectly matched the srt8. But with 93 octane predator tune and K+N intake it completely kicks ass over the stock 5.7 by a huge margin...... 14.18 I the quarter in hot Florida heat..... This thing runs up to 140 easy and was still pulling but that was enough for me. I have been sitting on a 6.4 VCTvcam for a whil and need to get it in and tuned..... 13's should be easy...... For a relatively stock 5.7 the srt8 exhaust is the best choice. Stock logs and suitcase muffler choke the crap out of our great hemi motors!!! TBF
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  #20  
Old 03-28-2013, 09:54 PM
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Re: SRT Exhaust conversion with Dual In - Dual Out Muffler

Did you keep your mids or swap in the srt8 mids Tampa bay? If so, how the hell did you get them to fit? I tried for hours and could only get about 1/10 of an inch clearance with the tranny pan.. And when everything heated up I saw contact. I dropped the tranny support two inches.... I found... The further you keep dropping the tranny support, the more clearance you get with the tranny pan. Someone has mentioned denting the tranny pan, but it is a risky move since the area where it is rubbing is very close to the spin on filter. And in the end you can only orient the mids down so much before they will start leaking at the manifolds.
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  #21  
Old 03-29-2013, 09:44 AM
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Re: SRT Exhaust conversion with Dual In - Dual Out Muffler

Does anyone have photos of the completed SRT manifold and SRT mid pipe install they could share? I can't seem to find any photos of it done anywhere. I'm particularly interested in how the tranny support looks dropped and how low it hangs.
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  #22  
Old 03-29-2013, 11:48 PM
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Re: SRT Exhaust conversion with Dual In - Dual Out Muffler

Sorry man, I didn't take any photo's... Because I wasn't too proud of it. There is a lot of power and stress on that cross member, just make sure you use hardened washers... And yes you can move the outer longer bolts to the inner bolt holes, so you only have to buy 4 super long bolts. Pull one out and go to Home Depot, they have the bolt size guide hanging the the fastener section... Then measure the bolt and add at least 2'' to be safe when ordering. I was preliminary pricing them out before I called it quits... They are probably $10 to 15 per bolt since they are metric, need to be a certain hardness, and special order from Massachusetts or somewhere... Maybe it was bolt depot that had them... Not sure. The tranny cross member is pretty visible without dropping it 2'', I just knew that I could never get away with it at smog time with all these washers glaring the smog tech straight in the face. There is also some trimming of metal/rubber bracket that is sandwiched between the tranny and the cross member, but nothing too bad, just the metal edge of it.

Food for thought... You can open up your stock cats to whatever size pipe you want, I've seen ram guys fabricate 3'' mids with the stock cats.
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  #23  
Old 03-30-2013, 10:34 AM
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Re: SRT Exhaust conversion with Dual In - Dual Out Muffler

There's probably a reason only you and a couple of other guys have done this mod. I'm beginning to doubt if this project is even worth the headache. If anything, I'll talk to an exhaust shop about cutting the flanges off the SRT mid pipes so they'll mate up to the manifolds and then adapt them down to the stock WK mid pipes. At the y pipe I'll use your recommendation of using a single in, dual out muffler and then exit out the center of the bumper.

I'm still waiting for my rear bumper claim to be processed. After a month of waiting, excuses about delays due to weather, and so on, Greyhound Express informed me they have lost my rear SRT bumper which I wanted to have installed before doing anything with the exhaust. Unbelievable I know. This just gives me more time to think about the right approach to the mid pipe/crossmember issues.

On a positive note I got the manifolds back from the machine shop yesterday and they turned out great. At the recommendation of the machine shop they drilled the extra bolt hole next to the EGR port in an oblong shape to avoid any alignment issues. The hole in the manifold gasket that you use as the template is also oblong so it was better to be safe than sorry.





Oh, and I had some fun with a wire wheel on the manifolds last night. Oooh, Shiney!

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  #24  
Old 03-30-2013, 04:07 PM
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Re: SRT Exhaust conversion with Dual In - Dual Out Muffler

Hey rock, I am 99.9% sure that there is no bolt hole where the machine shop put the oblong hole in your manifold... Ill check my old heads later to make sure...
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