What size is the stock mass air sensor in an 03gt? I just bought a 75mm T/B and i dont know what else i need to buy to get some power. Injectors and a mass air? Are stock injectors pink?

Is your car stock?

MAF and injector upgrades are not for adding power they are for supporting power. They will add no power at all just cost money for the parts and money for a tune inorder for your car to run. Yes your stock injectors are pink.

I have a bbk CAI, slp exhaust, and a T/B spacer, Pullies and different gears. I just bought the car; it was a repo. Auto w/ 55k for 9500. What else do i need with my T/B?Injectors,MAF, and SCT?

oh, and if my speedo says 80 and im actually doing 70 at 2400rpm, what do you think my gears are?

Read your replys. No injectors or maf needed. You have 3.73 gears

but i should get a tuner? sorry, this is my 1st 4.6. i Have a 95 with a mild 306. what else would i need for 300 hp?

For 300rwhp alot. Longtubes, heads, cams, intake, tune will get you 300rwhp.

Get a tuner but not a handheld get sniper. Handhelds are out of date now compared to sniper.

so what is the throttle body and plenum and injectors for. Forced air?

The OEM TB and plenum are overly restrictive, at WOT,starting around5200 rpm up wards. This restriction islargely caused by the plenum which IMHO should be replaced first if you are on a budget--here are some numbers and a narrative to back this up (http://www.paladinmicro.com/PalMFrame00.htm?wks=acu).[/align][/align]At 28" H2O differential the stock '01-1/2 to '04 plenum (which is slightly different from the '99 to '01-1/2 unit) and a 75 mm TB will flow 491 cfm. This is some 30 to 50 cfm less than any aftermarketplenum* and the stock 65 mm TB. [/align][/align]Also visible in these numbers (from Accufab's site) is that a 75 mm TBprovidesno appreciablylesser flow resistance at WOT. , At 75 mm and up the upper plenum/intake manifold passage becomes the weak link.[/align][/align]The OEM injectors and MAF are suitable for just about any n/a setup.[/align][/align]-----------------------[/align]* - The exception to this was the C&L plenum, which did not test well.[/align][/align]

he wont even need heads for 300BHP. but if u want 300RWHP then yes h/c/i and all the supporting mods would more than get u there.

thanks for all of the responses guys. im learnin so be easy on me. What is a sniper? will 300hp put me in the 12.5 to 13 second range?