What a great little mod DFW2011. I just got this car about a month ago because I totaled my 2012 300SRT8 loved that car. Right now Im getting the bugs worked out of the m56, it had a fuel pump issue and they are putting a new one in. I have several mods I want to do to this car though. I don't like how high it sits so asap I want to put some coilovers on to lower it some and maybe improve the exhaust some how while its up if I can find the right place or places, I don't want to spend much on the exhaust though. IF you have some suggestions on places to do these things that would be great. Im in south Flower Mound I assume your in DFW somewhere. I will buy the beer or a lunch or whatever if you would consider helping me w the resistor mod I don't have the tools and it sounds like you've done it a few times. Kind regards, James : )

Following - Can you give specs on the resistor? 660 or 680 @ 4.7 watts?

madmanpauly wrote: ↑

Thu Apr 23, 2020 7:17 am

Following - Can you give specs on the resistor? 660 or 680 @ 4.7 watts?

Sorry guys, brain skip on the wattage. They are 660 ohm, but they were 1/4 watt. 4.7 watts is what a little peanut bulb draws.

http://www.ceitron.com/cart/product_inf ... ts_id=9237

So in UpRev you can't tune out the IAT ignition tables?

On my LS platform on HP Tuners there is a separate table for IAT vs Ignition retard. Basically you just change the values to what you want them to be.

Not certain now but when I was messing with the M56 the IAT timing compensation table was not there. Also not everyone is Uprev tuned.

DFW2011M56S wrote: ↑

Thu Apr 23, 2020 9:13 pm

Not certain now but when I was messing with the M56 the IAT timing compensation table was not there. Also not everyone is Uprev tuned.

DFW I shot you a PM FYI..

X pipe or Straight pipe after factory cats to factory mufflers... I am after a bit more HP and low end torque but don't want it super loud but ok with a little more aggressive sound.... Then add some high flow air filters. Which option should I lean towards?

Just an FYI - I just dropped my car off to PPE Engineering for them to prototype long tube headers and full exhaust. Should be done in about a month and a half.

See my other thread for updates ppe-engineering-headers-and-full-exhaust-t626437.html

They will use my car to make their kit, so we will have a real, engineered exhaust for our rwd V8s. I wonder if the kit will fit the awd version? Hopefully so.

So I talked to 2 Muffler exhaust shops today. Both said the same thing about removing the Y and resonators then 2.5" X pipe back to stock mufflers. Very little if any power gains because the bottleneck is the Cats. One shop said they would remove the secondary ones the other would not. Both said it effects the sound and would be louder...Does anybody have some proof from a dyno or something else that this mod is more than sound and actually adds some low end torque from a stand still?? Just not worth it to me if it's only a sound difference. I was quoted $350 for x pipe and removing the second resonators leaving factory cats and mufflers. Thoughts?

Check YouTube for dyno vids

JimSim20 wrote: ↑

Fri May 08, 2020 3:22 pm

So I talked to 2 Muffler exhaust shops today. Both said the same thing about removing the Y and resonators then 2.5" X pipe back to stock mufflers. Very little if any power gains because the bottleneck is the Cats. One shop said they would remove the secondary ones the other would not. Both said it effects the sound and would be louder...Does anybody have some proof from a dyno or something else that this mod is more than sound and actually adds some low end torque from a stand still?? Just not worth it to me if it's only a sound difference. I was quoted $350 for x pipe and removing the second resonators leaving factory cats and mufflers. Thoughts?

Technically removing the Y-pipe (even though it is not monitored), is a no-no according to the muffler shops I've dealt with. Some shops will still do it though. Mine did. Removing the Y-pipe, which has the secondary cats welded to it and resonators (they choke down to 1-3/4" ID) will definitely enhance the flow. Since the car is tuned to run with the stock components, you will need a custom tune like Uprev to reap the performance benefit. Yes it will sound glorious even with the stock mufflers. I am running the sport mufflers which weigh less than half what the stock ones do. I've had multiple compliments from co-workers as I am leaving my shift. I paid about $350 to replace everything from the manifolds back with an X-pipe and duals to the mufflers.

Thank you so much for a more detailed info, I have no idea what mufflers I have. My M56 has the tech package and 20" sport wheels though. Your set up doesn't drone or too loud unless you floor it right? Im ok with at least same volume of what I had on that SRT8 300.
I did the carbon CFI carbon flush service this week and that has really made the car more peppy. My problem is I got used to a 6.4 Hemi in the Chrysler 300 SRT8 now wrecked. But I am liking this car more and more. It has more luxury and now I get a little warning if Im too close to others : )