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I have a 2015 Challenger RT with the 5.7 and automatic transmission. I am looking into building a custom exhaust with a local fabrication company. As of right now I have a CAI and an 87MM throttle body, I eventually will be doing a cam but it won't be for awhile. For my exhaust I want to.use Flowmaster original 40s and JBA shorty headers (Live in CA can't do long tubes) what I'm trying to decide is if I should do a 3" pipe with an x-pipe or a 2.5" I've heard lots of mixed feelings and am not sure what to do
 

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Is a cam the end of the line for performance?
Are you racing or just want a fun/loud car?
3” will be louder and breath more for a car with mods but with only a cam, you don’t need it unless you just want the noise. Your performance may suffer slightly going that large on only a cammed 5.7.
The opposite is true for 2.5”. You will retain some performance, it will not be as loud, but the diameter is more fitting for a cam only 5.7.


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Discussion Starter #3
Is a cam the end of the line for performance?
Are you racing or just want a fun/loud car?
3” will be louder and breath more for a car with mods but with only a cam, you don’t need it unless you just want the noise. Your performance may suffer slightly going that large on only a cammed 5.7.
The opposite is true for 2.5”. You will retain some performance, it will not be as loud, but the diameter is more fitting for a cam only 5.7.


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The cam would most likely be the end of the line, possibly porting of the intake manifold and heads depending on where I end up with the cam. Trying to get to roughly 420WHP but I want more bottom end power for launching and acceleration
 
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