yes they are worth it. i still have mine on and from experience, whether you race or just drive for fun, its a worth while mod that definately gives the car more pep.
intake, headers and exhaust are the basic trinity of mods almost every person has done for ages....the combustion engine hasnt changed (its still "suck-squish-bang-blow" ), and neither has the mods. after that most used to tune. then add a torque converter if you were into drag racing. once again still the same.
i highly dont agree the only performance mod worth getting is the predator..... if you get a tuner, what are you tuning.....a STOCK car. not really alot to tune there.
with headers, intakes, etc you get a larger effect on what you are actually tuning.
headers arent just
about making the "car sound better or sweet" (sure its a extra perk of the product, but not the sole reason)....they actually work with keeping the exhaust pulses from the cylinders seperated which is how the power gains come about.
take it from someone who has them...its a worthwhile addition. and at the price of shorties, 380-500$ they are affordable. most of us have spent cash on things like buying a front crosshair grill for around or over 150$ when you can find em on ebay OEM and painted for 35-50$...
if you liked and noticed that "feel" seat of the pants when you added a tuner, you'll get the same when you add headers... accelerating its far smoother with a bit more pull if you are into performance. that was the first thing i noticed when leaving HHP in Deleware when i had them installed a 2 or 3 years ago.
as for superchargers....well, think of it logically like the engine being a human eating and taking a sh**.... an intake allows air in slightly faster & more efficiently. exhaust and headers allow gases out more efficiently & easily.
why would you force feed something (add a supercharger), just to allow stock headers to constipate the side that lets air out? even in stock form, you put more air in, it makes sense to allow more air out...
this clip explains how they work, specifically short tube headers. cue it up to 6 minutes and 34 seconds for the header part
long tube headers are about the only way i would remove these, and prob will soon.
short tube headers work well in mid to high range, but give gains down low. but most will be seen mid to high range. they are also the easiest to install and give gains across the board. welcome addition to anyone who doesnt wanna change much, but still get gains.
long tube headers also work across all ranges, as short tubes do, but more power in the low to mid range. so if down low and mid range is where you need power most, like road course coming out of corners, or autoX... long tubes work most effectively.
(small hint, headers work the same as our intake manifold does with the short runner valve which doesnt open until 5,000rpm aka the high range. during low and mid range the longer runners are in use.)