I posted this in the D section, but I figured it was relevant enough to post it in the Ram section also, plus there seems to be a little more activity in this section.......

I'm getting a 40series put on the D tomorrow, looking forward to it (mainly because its making the wife happy, but Im excited too). I know theres a 10hp difference b/t the hemi-D's and the hemi-rams, mainly due to the exhaust setup, correct? Im assuming this is why the D is the "quietest hemi ever made". Well, with the HUGE main muffler and the resonator/muffler at the tailpipe gone, will this make up for the 10hp loss, or is the restriction coming from elsewhere?

Im not totally concerned with any hp gain, as there is usually very very minimal with just a muffler add-on. I was just wondering where the hp was lost between the D and Ram.

 

Possibly, The mufflers put onto vehicles from factory have a restriction of both noise and flow obviously (most likely emissions influenced). But the Flowmasters will help in the flow characteristic. You may just gain that 10 back, not gain the entire 10 or gain more than that supposed 10 hp loss between the two.

 

What size is the pipe on the Durango? Welcome to DF.

 

Nope, try again. Most Flowmasters actually flow worse than most stock mufflers due to the chambered set-up. Flowmaster is strictly on noise compliance and not flow charts. Their websit even proves this as well as many, many dyno charts showing that Flowmasters are all sound and little if no performance improvements.

 

Very true. You sacrifice performance for sound. I have the 50series DOR Flowmaster on my ram 1500 and it sounds great, but I didn't recieve really any noticeable power gains and actually noticed a slight loss in mileage. And the 50 series performance truck/suv is alot less restrictive than the original 40 series. If you are dead set on a FM put a 44 series on because it sounds like the 40, but actually flows better. If you want a deeper sound and increased performance then go with a magnaflow muffler. Their dyno's usually support a 9-14hp increase on average and that is at the wheels. Also the magnaflows are set for life since they are stainless steel, whereas the FM is an Aluminized steel which tends to rust out over time. If you are staying with a single muffler get a magnaflow 5x8 SI/SO 3'' muffler or go with an Aero Turbine 3030. Just my .02 but I believe that many will agree with me. After all I like the sound of my FM, but I can get a more refined sound with the magnflow and actually see a performance increase with it. Personally I will be switching to Magnaflow in the spring.

 

Might as well use a coffee can then huh. Thanks for correcting me, I still have to get around to studying the exhuast system & brands. Looks like I will have to bookmark their site. Atleast I had the right thinking path (with a performance muffler) just not the correct knowledge of the brand........

 

i remember seing something, maybe a commercial but it said the chambered design helped pull the exhaust from the engine seing a 10HP increse just in a muffler swap with no duals...i love the sound of my 40 but i would like to have the performance rather than the sound...help with my MPG's!! does the aero sound more like the FM? dont like magnaflow, had it on my ford and the sound cuts out after 3500 RPM.. just my .02

 

If you're going to go Flowmaster, you gotta go Super 44. It's still got the nice aggressive Flowmaster sound, but it's not loud enough to **** of the neighbors, and it flows better than any other FM muffler. I won't make any power claims on my 44s, but I will say that the engine is running smoother with the 44s than my old muffler.