l would like to know how to start like which part should l proceed intake? headers? and which brand? guys help!
its a coupe, im not sure where to start first? need help!

It helps if you tell us what kind of Infiniti you have..

'06 35...35 what though?

FX35? G35 sedan? G35 coupe? M35?

As l am not sure of which model you have, l would say that Stillen make great performance parts for all Nissan/infiniti products. l would suggest adding a supercharger and a hi flow intake. l would also want to look into improving the exhaust system as well

well it depends on what u r going for a daily driver, l would go with an all motor. so get cat back exhaust (stay away from an invidia because they have some problems with the pipe design, l know personally). intake (go with the stillen with z tube). & a intake plenum spacer. if u want to keep all the plastic engine covers under the hood, go with the thinner spacer. or if u dont care about the engine cover get a kinetix engine plenum. also cobb, dont know if its out yet, is supposed to come out with a reflash for the ecu. if u r not in CA , get hi flow cats.

the other route is forced induction. stillen has a supercharger kit, however u would need to modify the hood or get a stillen hood. hks, ati & vortech also have some supercharger kits

or u could go the turbo route l really like the jim wolf tech one. greddy(which is weak), aps, power enterprise, ssr eng, & turbonetics make kits

for forced induction expect to pay $3500-$7000 not including install & tuning, & if its auto, l would not do forced induction. also expect to pay for another $1000 for the exhaust for a turbo because its pointless not to free up exhaust gases.

for all motor expect to spend much less, unless u do a full build of the motor, which might as well do a AEBS stroker kit & expect to cost up the but for.

also dont expect that much gains out of it if u do all motor & just bolt ons because its a heavy car. if u wanted it to been faster with the same engine, should have gotten a 350z because it has a one piece carbon fiber reinforced plastic for lighter weight, meaning less rotational mass for quicker response. & a 350z wheel base is a few inches shorter so they r not interswapable.

also they have dual throttle bodies for a dual intake available on 2007+ 350z, 2007+ g35 sedan, 2008 g37