Ok, my car hit's 16.618 on 1/4 mile some weeks ago.
i order the eBay header 4-1 for my car, (55 dlls it's a good price lol).
I am surprised to see that the eBay header have 2" of diameter, SAME DIAMETER that the oem!!
i install the header, and i went to the track to race, the fucking time: 17.0 !!!!

i feel the engine with more power in the street before the track, but in the track, i feel the car, little slow, forced.

i discovered that the conector of cam sensor, it has a failure on connection (the connector has play) and i fix that with aislant tape (black), but with the heat of header, the glue is gone! i think this maybe the problem, but i don't want to buy a brand new cam sensor lol

so, the question is...

is a good modification the eBay header?

i'm sad :( , the car is slow because of failure of cam sensor?

P.D. i'm saving money to buy the parts missing of my turbo kit, i bought turbo,manifold,bov,ic piping. but i want down my time on 1/4 mile being N/A before install the turbo, because SR20 guy's kill me :(

Greetins, i'm sorry for many letters and questions, i hope that you help me. Thanks!