5.3 Gen 4 flex fuel afm dod delete need help

[Charlie207]

Thanks for the input, I always hear the same thing. Stock manifold works best. I’m now trying to figure what brand headers (Kooks, JBA, Gibson) I have brand new cats, and would like to do a cat back. I like the split exhaust style coming out behind the passenger side. Any suggestions with anything? Pulleys, throttle body, it has to get tuned no matter what. I’ve spent so much time cleaning, painting the engine pay and frame, replacing wiring. So any last minute suggestions? Thank you and anyone with any input. To answer the turbo, supercharger situation, I don’t think I can do any setup like that with the cam and internals I have.

Shorty headers provide absolutely minimal performance gains compared to factory/factory-style cast manifolds, so if you're looking for HP, you'll have to get long-tube headers. A good shop would be able to cut & weld your factory cats into long-tube headers to allow for emissions and all that jazz.

As a single source of info for LS hardware, look at all the dyno testing videos that Richard Holdener has done comparing intakes, cams, headers, turbos, superchargers, etc... He's fairly prolific with his content creation, and has been really good about answering questions in his daily/almost-daily YT livestreams.

The long, short, and hairy of it is that there really is no such thing as the wrong cam or intake or whatever combo. They all work, but some are better than others at peak power vs. usable power vs. any of a million other variables.