XoPtOn

iTrader: (2)

is it worth buying since there is no upgradable ecu chip for 99's? How many people have it? Theres not to many power mods for 99's =(.

Terran

iTrader: (6)

I'm confused. Why would you need an ECU to go with headers?

XoPtOn

iTrader: (2)

i thought you dont get the full potential of the headers if you dont combine it with a ecu... or something like that

chuckie311

iTrader: (1)

thats only with the mevi

XoPtOn

iTrader: (2)

i dunno, i thought i read somwhere about headers and ecus... or maybe it was mevi... som1 please give some more fedback on this

I30tMikeD

iTrader: (8)

The ECU has nothing to do with the headers

Shift_Power

Nothing at all. Mevi and ECU go together...not ECU and headers. You will get all gains promised. But a Y is a cheaper way to go and only has about 5 wheel hp less than headers.

XoPtOn

iTrader: (2)

omg.... thanks for the info. Gotta get headers then since i have a y-pipe, cai, and soon will have a cattback exhaust

1MAX2NV

iTrader: (5)

Depends if you are cali spec or fed spec? If you have a cali-spec 1999, What are you going to do with the precat and the check engine light?

XoPtOn

iTrader: (2)

damn im a cali =( i dont know what i'll do, i guess i cant get headers then

BlackBIRDVQ

iTrader: (15)

www.02simulator.com takes care of the check engine lights, I been runing that setup on my Max for quite some time. I would reather get the MEVI in your case vs the headers. Another thing is where did you come up with 5WHP more for headers vs y-pipe ? I never seen anyone dyno Cattman headers on a 4th gen, even Brian said in the last header thread in the 5th gen section of the .org, that he will refund anyone 50 dollars if a car dynos before and after the headers to show a HP gain.