Ditto what aaronstottle said. I have dual Super 40s on mine and mine is a little louder than my friend's regular 40s.

 

well the duals would be gettin the heat of the engine quicker, and thats always good for improving engine life. I dont know as far as performance what the difference is, but when your towing if the exhaust is straight out the back if you start up a hill while towing you can kink the exhaust tips between the ground and truck and thats bad.

 

This is probably one of the most common questions on this site besides CAI's. With that said I say it over and over. How much are you going to spend on your cat back system? My advice RESEARCH, RESEARCH and RESEARCH. Unfortunately most of us want to rush right out and throw an exhaust system on our truck for that nice aggresive sound plus performance. What are you really getting though? Not all exhaust set-ups are good for every truck. In my opinion. Flowmaster's are not the best for Hemi motor's. Just my opinion. Why I think that, well Hemi's perform better with Magnaflow, or Bassani's and a couple other's. Now some places charge 300-400 dollars for a cat back system. Only to really get about a 8hp gain and maybe 4 ft. lb.s of torque. My suugestion is this save your money up. Go for a true dual system, with an x-pipe!!! Headers will release that unwanted backpressure in your motor thus unleashing larger h/p and torque gains, throughout your low to mid-range. Now 4 cyl per side having it's own single pipe keeps that turbulance low thoughout the whole exhuast process. The x-pipe will actually keep an even balance per side per all 8 cyl. Now in regards to headers you have your pick of the litter. Long tube or shorty block huggers. Long tube give you an even balance of h/p and torque. Shorty's give more torque. Now my opinion is this. You can realease H/P all day long which is the easiest to get but if you don't keep those torque number's above H/P your defeating yourself and wasting your money. When getting your headers make sure your flange's are no smaller than 3/8 of an inch any smaller and run the risk of warping your flange's. By the way that's a bad thing. I honestly hope this helps you and any one else who read's this. I'm sure I will be writing this again for another thread. Please let us know how this goes for you. As far where you put your tips. it really doesnt matter honestly Your not adding any performance at your ***-end it all comes from up front.



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1Baddodge, judging from your post, you are very knowledgable on trucks, and engines. You provided alot info on the topic of exhaust and hedders. But what about Mufflers? I hate to keep beating a dead horse, but, does your above post also include Mufflers?
I have to admit, I am not knowledgable on the topic, so i come here (This Forum) to obtain it. So do me a favor pal, and shed some of your knowledge on me. am i making a wise decision, by installing a Flow master 40? I don't have a Hemi, but a 4.7 LTR V-8. Is it wise to keep the single exhaust? or should i look to later have a dual exhaust installed?

 

I've got the 4.7 as well, and in my opinion the 4.7 doesn't have enough output to justify a dual setup. You would lose a TON of backpressure leading to valve problems. The 5.7 and other hemi's, sure, I can understand that. Lots more output there, but the 4.7 just isn't the prime canidate. I know there's a lot of guys on here that I'm sure know more about this subject than I ever will, and they may just disagree, but like I said, just my opinion. I'm gonna go with either a singe Super 40 or an Edelbrock SDT. I'm sure the single will be perfect for this engine.

 

I went with the 2.5 inch duals (Flowmaster 50 series HD) and a magnaflow X-pipe on my 4.7. Truck feels great, looks great, sounds great and gets a couple more miles per gallon....but has lost a touch of the low end torque. That being said, if I had it to do over I would still go the dual route with an x-pipe but with 2.25 inch pipe instead of 2.5. Just my .02 cents.

 

Go with the dual exhaust not only for looks, but also that mpg factor

 

In responce to your question I'm sorry I did not notice you had the 4.7 cyl motor. Well in responce to your question to your motor well you have a motor that was produced by Chrysler to appeal to the MPG crowd who still wanted the Ram series truck. So honestly if your trying to get the H/P and Torques that a Hemi has don't waste your money. You will never reach the appex that a HEMIspherical head can manage. I'm sorry to break this to you but it is the truth. If you are happy with what you have then so be it. So than do a simple cat back exhaust and DON"T waste your money on trying to make a competitive truck be happy with what you have. Remember your truck engine was made for being good on MPG. Let me know if you have any other questions I will gladely help if I can.

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If you're going for more power, definitely do your research on different mufflers. I wanted more sound than power so I went with the dual Flowmaster Super 40s. It sounds great and it turns heads wherever I go. I think I'm over my street racing days so I'm not worried about the supposed torque loss with Flowmasters that is claimed by other people. It's amazing how much Flowmasters claim HP increase for vehicles when in fact they do not, in some cases, improve HP at all. For as much money as they make they should have a HP chart for all major vehicles. My friend just ordered 2 Aero Turbine 3030 mufflers plus an "X" pipe so he might see more of a HP increase than I did. Also make sure you have the right pipe size, and if you do tips I would go stainless steel if you live in an area with a lot of rain and snow because once those tips get chipped by a rock they will start to look like hell like the chrome ones do. I have Silverline stainless steel tips. Good luck.

 

AIRRAM would more than likely disagree with you.. Not hard to make a 4.7 outrun a Hemi... But, you are right about appealing to the MPG crowd.