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Whether it's worth it is a subjective question. Headers might get you about 5-10 whp gains depending on which ones you go with. Personally, I stayed NA and did everything except for headers since it didn't seem worth it to me.
Just about everyone here will tell you that it's better to go FI for hp per dollar.
Normally I do FI on all my cars but this one has quite a bit of miles on it lol FI will likely kill it lol, after it dies and I do a rebuild I MAY but for now, I'm kind of following the path you took.
If you dont mind me asking with all mods (no headers) what kind of power are you making?
On a Dynojet, I think stock at the wheels is typically somewhere between 230-240 based on what I've read from some other threads for the non-rev up DE.
Normally I do FI on all my cars but this one has quite a bit of miles on it lol FI will likely kill it lol, after it dies and I do a rebuild I MAY but for now, I'm kind of following the path you took.
If you dont mind me asking with all mods (no headers) what kind of power are you making?
Go FI ... you can get quite a bit more out of the engine.
Get a compression test and see how the engine is doing
I'd argue that staying NA, bolting on a bunch of parts, retuning, and driving the car hard (to get the most out of the parts you just put on) will do more damage and accelerate age more than FI. FI will make your engine more efficient ... you can drive the car under 6000rpm and be perectly fine and get 400hp all day long.