The suitcase is your friend (the middle muffler). Leave it alone. Seems like the rear reso is ok to remove, but I personally haven't done it and compared it on a dyno.

 

The suitcase is your friend (the middle muffler). Leave it alone. Seems like the rear reso is ok to remove, but I personally haven't done it and compared it on a dyno.

That suitcase is a major choke point for the SRT exhaust. If I had a SRT 6.1, I would remove it ASAP. Why? Because it the same exact muffler as the 5.7L performance exhaust and that muffler is only 2.25" diameter piping, while the rest of the SRT 6.1 exhaust is 2.75". So you have exhaust flowing out the headers into 2.75" piping, then pinching down to 2.25" at the suitcase, then at the suitcase outlet, back into 2.75" piping to the resonators. Simply removing that suitcase should give you the largest improvement in exhaust flow for very little coin.

 

I just had Blastin Bob put on a set of resonated tips to replace the rear mufflers. Sounds really good at low end and midrange. When I also put on the intake the top end got some nice sounding grunt. I'm spinning the tires more easily now so I know the combo picked me up some hp.

Not too expensive either, the used intake (I installed) and the new resonators that Bob installed was just over $300 altogether. Pretty cheap price to pick up some ponies and make the car sound a lot better.

BTW, I almost went with the straight pipes without the resonators but Bob said that unless I wanted the car to be really loud that the resonators would be a better alternative. Glad I took his advice.

 

I just had Blastin Bob put on a set of resonated tips to replace the rear mufflers. Sounds really good at low end and midrange. When I also put on the intake the top end got some nice sounding grunt. I'm spinning the tires more easily now so I know the combo picked me up some hp.

Wait until you get a thousand miles in. The Blastin' Bob's sound great when you first put them in but they sound awesome after they season. The car is definitely louder, the burble is lower and the WOT is better than when they were first installed. I had mine done last spring. I got the glasspack version.

The AFE Stage 2 CAI is coming this week :biggrin:

 

Leave the suitcase, just remove the resonators. It really wakes up the HEMI sound!!!!!!

 

Thanks all! I will probably remove the resonators first to see if can handle to sound. If it is too loud I may do the Blastin Bob's or put the resonators back on.

 

First check with those that have deleted the resonators. See if drone is an issue. If not, go for it.

If that is too loud for you, then go for the Blastin' Bob's. Either way you will never go back to the resonated version.

The resonators are there for a reason. Whether it is to lessen the overall Db's to meet specs or to eliminate drone, there is a purpose. The designers and bean counters wouldn't throw 60 pounds of scrap metal back there for nothing.

 

So I go to a recomended muffler shop here in OC and the guy tells me that I won't be able to notice a difference with removing the resonators. I try to tell him that my loyal counterparts on this site have not only told me they have shown me via-video that this makes a huge difference.. He still argues!

Then I ask if he can install my posi-quiets for me and he said those pads are ****?? I'm like "You really don't want my business do you??"

 

yeah thats funny.

go somewhere else. even if he didnt think it would do anything, what does he care? it's money.

 

I've got the Blastin Bob 11dB deletes (straight pipes). They sound great at WOT, but are still pretty quite at idle (a bit more grumble). Cruising is a bit better then stock too. The drone did increase, but not bad enough for me to regret install. If I had to do it again, I would. Check out vid.

Video of 11db resenator delete burnout - Photobucket - Video and Image Hosting

 

Something to remember... If you have the 350 HP version w/ the different suitcase, like on the R/T or SRTD, then you must think twice about the resonator delete. I did it on my SRT Design, and it is way too loud in the interior. I'm going to need to get the Blastin Bob's kit, to quite it back down, and I'm not sure which one yet, but straight pipe is crazy droning at 2000 RPM.

 

Where can I find the Blastin Bobs!

Where can I find the Blastin Bob's at a reasonable price?

 

Again thanks for the tips! I went by today and met with Brian (SOCALSRT8). He has the two tone flat black lx with Magna Flow exhaust and custom wheels! Rediculous car by the way Brian!

What a great car with the perfect sound. The Magna Flow is for me, already ordered!

 

I'm interested in the modification but it looks like there are mixed opinions. Couple of questions:

1. Suitcases? What are they?
2. Whats the difference between the above and the Resonator?

I want sound but not a loss in HP!

Give me the LOWDOWN!:fing02:

SHARK22 this is an awesome mod! I had this done a few weeks ago but unlike most i had same sized pipes mandrel bent to replace the resonators. Picked up 19.9hp. Yes, i did a before and after on the dyno. Oh and it sounds great, with no drone at highway speeds at all. A little drone at around 1700-1800 rpm when picking up speed through the gears but nothing major. I'm very pleased with the result.
Check out my post on the Australian forum under RDP Mackay CMR Tune

 

Blastin' Bob was running a special which may have expired, check with him to find out. Beyond that the only other way to get one cheaper is to wait for one to come up used for sale.

 

Blastin Bob's 6.1 Resonator Delete..I LIKE 'EM..

I've had the BB-6.1 resonator delete kit on my car for awhile now. LOVE the sound..
Low rumble at idle, at WOT ..You know you have a Badazz HEMI..
At normal cruise..sounds like it should sound from the factory-IMO
Take off the resonators, run it like that for a week or whatever time it takes for you to
decide if you want to go forward, or go another direction. I think you'll like the BB, I
know I do..LOL..even my girlfriend says it sounds good..THAT's Great..
Stan

 

Alot of SRT8 guys here... Sorry but I'm wondering if any of you have SRT8 coil springs if you lowered your SRT8... I'm looking for some to mildly lower my SRT Design... I know it's off subject, and appolagize, but thought one of you might want to sell your coils. Thanks.

 

Unless you change to high-flow cats, nothing you are doing to your exhaust is making much of a difference...other than turning up the volume. Go to a dyno and check if it "feels" faster.

Eric

 

Unless you change to high-flow cats, nothing you are doing to your exhaust is making much of a difference...other than turning up the volume. Go to a dyno and check if it "feels" faster.

Eric

So the first choke point is the factory cats...then the suitcase. You'll have to do both as you probably won't see any gains or very little from high flow cats with a suitcase that constricts the exhaust from 2.75" down to 2.25".

 

Blastin Bob's 11db res. replacement pipes sound awesome on my 300c. I made the mistake of removing the suitcase, had to put it back on. Leave the suitcase & get the 11 db res. replacement pipes! I believe you will be happy.

 

sheesh

the forum is full of real life experiences to back me up... exhaust work on these cars rarely nets anything but noise without careful tuning.

Yet another example... my good friend Jeff got an 07 Charger SRT8 (stole it!) and we immediately began "performance testing". His car was a tick slower than mine (stock program), about 1.5 lengths from 0-90 mph. We expected this as he has 700 miles and I have 26000.

He immediately went out and removed the resonators, and even I love the sound outside. Inside is way too loud at certain speeds for my taste. But the funny thing is his car was actually slower!

Haven't done any data logging on him yet but we will and I bet we can tune his car to make the exhaust work perform better. But stock tune just does not like mods.

 

Those results are not surprising given our speed density system we have. As you said, you will not see much gains with mods to intake and exhaust until you tweak the ecu. The speed density system just can't make much adjustments to take advantage of increase airflow. However, once tuned for such, the improvements should be quite good.

 

What people don't realize (I was one of them when I did the suitcase delete) is this isn't your 60s muscle car where you can stick the fattest pipe and biggest mufflers to get the best performance. The exhaust needs to be tuned to this car. I've personally seen the magnaflow system gain hp on the dyno.

 

What people don't realize (I was one of them when I did the suitcase delete) is this isn't your 60s muscle car where you can stick the fattest pipe and biggest mufflers to get the best performance. The exhaust needs to be tuned to this car. I've personally seen the magnaflow system gain hp on the dyno.

Actually, I would argue its pretty much just like a 60's muscle car, which had a carb. and not fuel injection. You have to tune the engine just like the 60's engine to see the gain from the increase airflow. With the 60's muscle car, you would change the jets in the carb and take plug readings and even adjust the timing. With the Hemi, you will have to also adjust the fuel and possibly the timing as well, except you will use a computer to input a new fuel curve.
Remember, an engine is nothing but an airpump. The more air you can pump through it the more power you will make.
Because we have a speed density operating system, the Hemi is limited to its adjustments to increased airflow. It can't compensate like a Mass Airflow system can. If the magnaflow system is making more power than stock, yet a suitcase delete is making less than stock, then I would say the suitcase delete has increased the airflow rate beyond what the speed density system can handle and once tuned, ie. reprogrammed, it should yield a larger power increase than the magnaflow system.

 

Topfuel!

You need to have a predator or something of that nature to change the settings on the CPU to realize the gains with a Dyno and exhaust correct??

 

CMR tune to be exact

 

Ok I may be puting my foot in my mouth with this being my first post on this forum and I may be off topic here but am I to understand that unless you retune the car, intake and exhaust don't really make a difference? If I put the intake and exhaust off of an SRT8 would it make a difference without tuneing, or at all?

 

good.... and cheap

 

Wow thanks for the great info TopFuel I appreciate it.