That is true.
As with most anything, quality costs money. Power costs money, reliabilty costs money. Want all three, start saving now.
None of which come's cheaply.
Want reliabilty invest in tuning
Want power Invest in tuning and quality
want quality, get a good job

...
Want to get a "KIT" as cheaply as possible go for the non-intercooled greddy kit, while it's the cheapest it also makes the least amount of power, and is the least reliable (as far as pre-fabed kits go).
Got some money to spend, go for the full race kit, sure it costs 3 times that of the greddy kit but you also get 3 times the power, 3 times the quality, three times the reliability, and not to mention a bov, intercooler, and the bling factor of having that badass manifold.
In this sport money = power and reliabilty.