Best hp gain on 04 all stock gto under $1000? - Pontiac GTO Forum
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post #1 of 11 (permalink) Old 04-26-2011, 12:34 PM Thread Starter
 
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Best hp gain on 04 all stock gto under $1000?

Hey,

I just bought a great 04 gto with 100% stock parts and I'm looking to up the horsepower a bit. I'm fairly new to engines, and I don't know very much. I've heard airflow and an on board computer is the best way to go, but what would you recommend as the best upgrades for under $1000? I'll be getting more money in about a year so these won't be the last upgrades I make, so I'd rather not have to upgrade the upgrades later on, if possible. What should I do?
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post #2 of 11 (permalink) Old 04-26-2011, 02:40 PM
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Headers and a tune (it has a computer you don't need another one) are the best first HP mods and get you set up for the next upgrade (cam). Please don't run out and get a act-back exhaust system. It's probably the worst bang for the buck on a stockish car

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post #3 of 11 (permalink) Old 04-26-2011, 04:53 PM
 
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I agree with everything you said but headers and a tune will be really close to going above his $1000 limit, if not passing it. Even with Rustsetters, you need midpipes and have to have the things coated plus 350-500 for a tune (my shop charges 450).

I don't have anything against aftermarket cat-backs. I love my Borla, was the 4th thing I did after my K&N cai, Diablosport Predator, and JHP gauges. I lost 20 pounds off the porker, gained T-304 stainless, and a cool low rumble. But at 1000 bucks for 5-ish hp, you're right, not good $/hp investment.

Myself, I'd buy a quality set of headers and save up later for a tune. You've got plenty to choose from (Kooks, American Racing, Stainless Works, SLP) (listed in my order of preference). You can't go wrong with stainless steel and you'll gain 20hp out of the box with no tune and improved gas mileage. My car gained 2.5 mpg with just the headers and had Diablosport e-mail me their canned header tune which may have gained a little unnoticeable hp, but didn't really do anything for gas mileage. Maybe less black soot on the inside of the tailpipes.
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post #4 of 11 (permalink) Old 04-29-2011, 07:07 PM
 
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Svede1212 hit the nail on the head.

Log onto Marylandspeed. Order up a set of Pacesetters Lt's and mids, get a tune and pocket some change.

H/C/I; 3:73's; 475 rwhp
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post #5 of 11 (permalink) Old 05-01-2011, 03:20 AM
 
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Longtube headers,mid pipe,catback exhaust, and tune is a great bang for the buck.Horsepower gains will be very minimal just installing a catback only but,your GTO will sound good though.
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post #6 of 11 (permalink) Old 05-01-2011, 09:24 AM
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"Sound good" has seemed to become loud and "look at me". GM actually spent a lot of time on the '04 exhaust note and recreated the original GTO sound. Many consider it one of the best ever and certainly better than the '05 & '06. Back when I was stockish I had a muffler shop tell me I could buy this one muffler and bolt on 40-60 HP. I ran from that place very quickly.

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post #7 of 11 (permalink) Old 05-02-2011, 09:19 AM
 
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Originally Posted by svede1212 View Post
"Sound good" has seemed to become loud and "look at me".
As proved by the exhaust "competition" we had at our cute little auto show yesterday.

And, this is why you'll see 30 people suggest a Spintech or Corsa before you hear anyone mention a Bassani/Borla/Magnaflow.

As for the OP, I noticed a difference with my mods, which was about ~$2000 - thats HPTuners, a wideband, a laptop to run it, Svede's airbox, and the catback. The weight was free though.
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post #8 of 11 (permalink) Old 05-03-2011, 12:41 PM
 
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As proved by the exhaust "competition" we had at our cute little auto show yesterday.

And, this is why you'll see 30 people suggest a Spintech or Corsa before you hear anyone mention a Bassani/Borla/Magnaflow.

As for the OP, I noticed a difference with my mods, which was about ~$2000 - thats HPTuners, a wideband, a laptop to run it, Svede's airbox, and the catback. The weight was free though.
I <3 Bassani

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post #9 of 11 (permalink) Old 05-04-2011, 07:31 AM
 
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The only problem with buying pacesetter is they do not make Catted Mids so in the end once you buy cats and have the Pacesetter mids modified your only saving a couple hundred bucks from getting good quality Longtubes. so to me its worth the extra money to just buy prefabricated and dont have to worry about it..IMO
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post #10 of 11 (permalink) Old 05-04-2011, 11:09 AM
 
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The only problem with buying pacesetter is they do not make Catted Mids so in the end once you buy cats and have the Pacesetter mids modified your only saving a couple hundred bucks from getting good quality Longtubes. so to me its worth the extra money to just buy prefabricated and dont have to worry about it..IMO
You can weld your stock cats into the Pacesetter mids. High flows aren't going to make much of a difference until you make some high HP or going FI.

2003 Corvette Z06 - MGW shifter, Corsa X pipe, Corsa Xtreme exhaust, Texas Speed long tubes w/o cats, PowerStop rotors/pads, Conti DWS tires, C6Z51 F&R sways, C5R headlights, tuned

04 GTO - sold
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