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Discussion Starter · #1 ·
Good afternoon,

Bought a 2018 300C with the 5.7 as my daily to replace my 2010 Ram. I’m trying my hardest to not scratch the modify-itch, but I did the basics, namely the exhaust. Lately, though, I have been thinking about changing a few things, such as making this boat handle a bit better andgetting rid of the chrome. Maybe someone can talk me out of it…

I want to keep it as much of a “daily” as possible for the comfort of my 1 year old son, which was the main reason for the purchase. I also normally autocross my 1974 Camaro, and I think it would be fun to try it out in the 300. Hell, I’d love to get it up to Laguna Seca.

I’ll start a few threads related to the questions I have. Here are a few pictures of the rides.

 

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2020 300S 5.7L, Alloy Edition, Black on Black
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Good afternoon,

Bought a 2018 300C with the 5.7 as my daily to replace my 2010 Ram. I’m trying my hardest to not scratch the modify-itch, but I did the basics, namely the exhaust. Lately, though, I have been thinking about changing a few things, such as making this boat handle a bit better andgetting rid of the chrome. Maybe someone can talk me out of it…

I want to keep it as much of a “daily” as possible for the comfort of my 1 year old son, which was the main reason for the purchase. I also normally autocross my 1974 Camaro, and I think it would be fun to try it out in the 300. Hell, I’d love to get it up to Laguna Seca.

I’ll start a few threads related to the questions I have. Here are a few pictures of the rides.

Welcome. My 2020 300s 5.7 has an x-pipe and a crossover at the rear of the mufflers stock - maximum efficiency was achieved without any 'noise'. Was your car any different?
Tire Wheel Car Sky Vehicle

My car....
 

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Discussion Starter · #5 ·
Welcome. My 2020 300s 5.7 has an x-pipe and a crossover at the rear of the mufflers stock - maximum efficiency was achieved without any 'noise'. Was your car any different? View attachment 21828
My car....
Mine has the factory “x-pipe”, but no other crossover toward the rear.
Hood Automotive tire Motor vehicle Automotive lighting Yellow

This was before I put the full-size Ultra-Flo mufflers on.
 

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2020 300S 5.7L, Alloy Edition, Black on Black
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Mine has the factory “x-pipe”, but no other crossover toward the rear. View attachment 21829
This was before I put the full-size Ultra-Flo mufflers on.
Appears to be an aftermarket exhaust setup. No images of my factory setup at the moment unfortunately. Truly impressed with my factory setup. Hoping someone else can provide some insight....
 

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Discussion Starter · #7 ·
Appears to be an aftermarket exhaust setup. No images of my factory setup at the moment unfortunately. Truly impressed with my factory setup. Hoping someone else can provide some insight....
I should have said this was before the UltraFlow Mufflers, but after I changed up the factory exhaust quite a bit. The setup in the picture sounded awesome, but the drone was unbearable.
 

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2020 300S 5.7L, Alloy Edition, Black on Black
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I should have said this was before the UltraFlow Mufflers, but after I changed up the factory exhaust quite a bit. The setup in the picture sounded awesome, but the drone was unbearable.
Next time my 300 is in the air, I'll get images of the exhaust system - truly impressed. A proper factory exhaust without the noise. The current Eagle 5.7L motor is available in multiple variations from 363hp to 395hp (advertised net), with and without MDS and with six reported available cam profiles, depending on the application.

My 300 just received its second annual service at the dealer, came back to me with a different tune. Service bulletin? Quicker throttle response and just feels better throughout the rev range. Not complaining now and had no complaints previously.

Keep in mind the late model stock 5.7L engine (on premium fuel) makes slightly better numbers than the high compression 440 Commando motor of yesteryear (320 RWHP vs. 305 RWHP). 330 RWHP for the 440 6bbl for those interested.
 
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