How to make your 5.7L Hemi challenger charger 300 faster 6.4 Hemi headers on a 5.7 Hemi DYNO Results

This video covers what it takes to get 418wtq and 377whp on an otherwise stock motor 5.7. Only modifications on this car 6.4L (SRT) exhaust headers, catless, and hellcat injectors. This car is tuned on e85 and made quite the impressive gains in torque.
With simple bolt ons and going to e85 you can improve the output of your hemi motor significantly. Stop wasting your money on catbacks, mufflers, and "CAI" intakes that don't do nothing for you performance wise.
hmu on instagram @ ReidPerformance
Thank you to everyone supporting the channel!!

[@juandelgadillo4950]

sounds fkn beautiful 😤

[@ReidPerformance]

@juandelgadillo4950 🙌🏻💯🥹

[@GRIM.2002]

This channel is gonna be huge in the mopar community , he’s been pushing good ass content 💪🏽

[@ReidPerformance]

@GRIM.2002 thank you!! I am really trying to be a good knowledgeable resource! See too many videos out there that are all the same but don’t have the accurate data you need!

[@ReneRodriguez-zw3fk]

When you connect the 6.4 manifold you left the active runners open on tuning ?

[@ReidPerformance]

This car did not have the 6.4 intake manifold. These are the 6.4 exhaust manifolds. They have no runners.

[@cristianbello4621]

New sub here you definitely have knowledge I’ve been reading some of the comments and I’ll definitely be reaching out in the future now would you happen to know much about the awd pursuit 5.7’s ?

[@ReidPerformance]

@christianbello4621 thanks for the support. Yes I do. I have remote tuned a few of them in Florida

[@YkShotti]

New sub 🎉 great video

[@zaeburner]

To go e85 U did nothing to the fuel pump just 6.4 manifolds catless n kitty injectors wit tune ? I have all those parts on my 14 300c 5.7 n thought I couldn’t go e

[@ReidPerformance]

@user-uw3jj4sq3c yep that is all that is needed. Stock pump can handle to about 420ish hp. Dm me on insta be happy to tune it for you!!

[@YkShotti]

I have a 14 300 5.7 did you change your throttle body and cai or are they stock?

[@mcm95403]

So what was the output before the E85 and 6.4 exhaust?

[@ReidPerformance]

@mcm95403 this car did not have a before dyno. But stock 5.7s generally make 330-340 and 340-360wtq on this dyno

[@ronbo422]

So the 5.7's like 12.5 - 12.6:1? Good to know.

[@ReidPerformance]

12.5 is .85 lambda which is generally the goal of tuning WOT. Some cars make more power a little richer.. some make more power a little leaner

[@ronbo422]

​@@ReidPerformanceMy 6-spd '14 R/T was programmed for a pig-rich 11.6:1 WOT. That was the base .0688 FA Stoich + WOT adder, up in the 4K+ rpm range. I leaned it out to about 12:25:1 commanded at WOT, only run 93-octane and she seemed to like it. No indicated knock, to speak of. I need to get it on a dyno with a WB O2 sensor. I hear NGK WB meters are good, and cheaper than a Ballenger AFR500.

[@ReidPerformance]

@ronbo422 I use the AEM 30-034. Although you are commanding the 12.2… it’s best to not play with WOT fueling unless you have a wideband on it. It might command 11.6 in stock form.. but I’d bet it actually isn’t that rich at wot because of the injector data set up. I would guess it’s closer to the 12.1 area.

[@ronbo422]

@@ReidPerformance Thanks for the tip. I put an AEM 0300 sensor kit, and a Prolink+ cable, in my Amazon cart. I'll return the WOT tables back to their stock values until I install it. On a slightly diff subject, what values do you address when longtube headers come into play? I know Transport delay has to be increased but are there other changes to the tune that are needed? Or will ANN "deal" with the increased exhaust (scavenging effect)?

[@ReidPerformance]

@@ronbo422 message me on Instagram and we can talk about it

[@gioacuna5615]

Do you do email tunes?

[@ReidPerformance]

@gioacuna5615 yes I do!

[@brocknall242]

will the 6.4 headers connect to the stock cats on the 5.7

[@ReidPerformance]

@brocknail242 you need 6.4 mid pipes as well recommended

[@brocknall242]

@@ReidPerformance okay is a tune required? and do the 6.4 cats bolt up the 5.7 exhaust or does it need a reducer

[@ReidPerformance]

@brocknall242 not required but beneficial Needs a reducer or to be welded up

[@edmondcarter9457]

@@ReidPerformanceI believe you already answered the question but with going with 6.4 headers I should get the 6.4 mid pipe with the catted converters right? I have an 05 magnum/charger rt rwd

[@ReidPerformance]

@edmondcarter9457 not sure if it will bolt up to the pre eagle versions.. but yes the matching midpipe will make it easier