Just wanted to post my dyno results for my 04 GT with an auto tranny:

Mods:
Diablo tune with the following mods: +10 spark advance and fuel leaned out 5.5 for 4-7k rpm
SLP Loudmouth I catback
BBK UDPs
Ford 4.10 ring and pinion
Removed intake silencer and have K&N Filter

RWHP on a Dynojet test at 91 degrees F: 237.26
RW Torque: 282.76

I've heard that stock GTs get ~ 216 RWHP (not sure if this is for auto or manual tranny but I heard auto kills some HP so it could be less than this with an auto).
Note on the diablo fuel lean out: I gained 4.75 RWHP from the stock diablo performancetunejust by leaning the fuel out in the 4-7k range. The computer hooked up to my car during the firstdyno run showed that my fuel was rich above 4k, so I just leaned it out to be "5.5" towards lean in the diablo and my carwent from 232hp to 237 hp.

Ordered a 70mm bbk TB and accufab plenum, just waiting on them. Next mods will be LT headers/catless midpipe and head work.

 

not too shabby. my friend has an auto and has the same basic mods as you do but without the UDPs and with a mac H pipe and he ran 242rwhp. im wanting to see what a full exhaust will put you at.

 

MM&FF dyno'ed an '04 stock at around 236ish.....That damn auto you have is killin you.

 

Damn, I cant wait to get mine done then. I really didnt think it would be that high. From what I've been told, thats about where I should be at, but I have a few more mods done than you, and I will have an SCT Xcal II tuner by the time I get the dyno done too.

 

Your avatar FLOORED ME!!!!! Predator...... Gotta love Ahhnuld

 

Hahaha, I "lol" every time I look at it.

 

#s sound about right to me for a car with your mods and an auto. Stock it should put down around 215ish thru the auto, or 225 with a stick.

 

Those are pretty good #'s!

 

Thanks all! yea i'm happy with what I saw from the dyno.I'll do another dyno after I get the headers, catless hpipe, TB, and plenum installed later this year or next year. And I'm sure I'll do it again when I get the head work done.

 

i guess my numbers arent that bad either, i thought mine were low but i have all bolt-ons and headers

247/284 on a dynojet