42# injectors for an '04

**Sudden** · 06-01-2014

I searched and read all I could find on injectors for an '04 GTP but I would still like the opinion of some people that have them. I have 1.9 rockers, a PLOG, a 3" catted down pipe, A S2IC from ZZP, and a 3.4 pulley. What brand of injector seems to work best for our cars.

TIA

**darkhorizon** · 06-02-2014

Shouldnt need to upgrade unless you really want to add more mods.

**darkhorizon** · 06-02-2014

If you do I always suggest the 39# mustang injectors. They flow a bit higher than 39 usually and are a cheap direct drop in.

**Sudden** · 06-02-2014

I'm planning for a little more modding.

**wa04compg** · 06-02-2014

As dh just said cobra 39lb are a great option cheap easy to find and ev6...39lb is at 40psi so they are actually 42lb ish at 43.5psi...bought a low miles set this morning off eBay for $137

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**dsmuts** · 06-02-2014

I bought 42.5# with the adapters for my car

**Sudden** · 06-02-2014

Originally Posted by dsmuts

I bought 42.5# with the adapters for my car

Is one brand better than the others?

**dsmuts** · 06-02-2014

It's all about the same from what I've heard. I'm running lucas

**Overkill** · 06-02-2014

I have 44# GM injectors available plus a MAF upgrade, both which you'll need beyond a 3.4.

**Sudden** · 06-02-2014

Originally Posted by Overkill

I have 44# GM injectors available plus a MAF upgrade, both which you'll need beyond a 3.4.

I'll email you.

**dsmuts** · 06-02-2014

Originally Posted by Overkill

I have 44# GM injectors available plus a MAF upgrade, both which you'll need beyond a 3.4.

Why do you need a maf upgrade? I'm on a 3.2 on stock maf.

**darkhorizon** · 06-02-2014

A 3.2 and a stock 04 maf are good on stock injectors on a 04.

**Sudden** · 06-02-2014

Originally Posted by dsmuts

Why do you need a maf upgrade? I'm on a 3.2 on stock maf.

DSMUTS, Yeah, everyone is telling me I need a MAF upgrade or a PCM upgrade. Did you get your PCM tuned for the 42#s?

Dark, DSMUTS is on 42.5# injectors.

**dsmuts** · 06-02-2014

Yeah you need tuned for injectors

**nik12937** · 06-02-2014

Maybe get a fuel pump rewire too while you're at it? Casper seems to be a good brand.

**Sudden** · 06-02-2014

Originally Posted by nik12937

Maybe get a fuel pump rewire too while you're at it? Casper seems to be a good brand.

Is there a fuel pump rewire made for '04+ GPs?

Sorry, found one.

**nik12937** · 06-02-2014

I was gonna say, I thought it was the same or at least very similar

Just a pain not having an access panel to the fuel pump right in the trunk.

**dsmuts** · 06-03-2014

Originally Posted by nik12937

I was gonna say, I thought it was the same or at least very similar

Just a pain not having an access panel to the fuel pump right in the trunk.

04- some 05 have that access panel

**Overkill** · 06-06-2014

Racetronix makes a rewire that plugs in underneath the vehicle by the gas tank for 05+ with no access panel. Still has the small wiring between that connector and the pump but at least it replaces everything else.