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Old 08-10-2012, 04:25 AM   #1
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08 GT

Hey I got my 08 GT a few months ago and I'm wanting to increase the hp some. I'm looking for 4-5 mods that won't break the bank (i.e. no supercharger or motor swap) but I do plan on putting a sc on in the future. So I'm looking for some upgrades that will work with one when I get it.
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Old 08-10-2012, 04:30 AM   #2
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Cai and a new tune, then complete exaust is where I'd start.
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Old 08-10-2012, 06:13 AM   #3
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Quote:
Originally Posted by tc x 4
Cai and a new tune, then complete exaust is where I'd start.
+1. Then suspension and gears.
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Old 08-10-2012, 12:30 PM   #4
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Cool. That's right along the lines I was thinking. On the topic of exhaust, what do you guys think about Cervinis side exhaust? I like the sound I just want to know about the quality.
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Old 08-10-2012, 12:38 PM   #5
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Quote:
Originally Posted by tc x 4
Cai and a new tune, then complete exaust is where I'd start.
X2
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Old 08-10-2012, 12:40 PM   #6
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Re: 08 GT

Gears are a real seat of the pants mod. It's not gonna get you any gains but going from a 3.55 to a 4.10 is a huge difference on the butt dyno and will get you in the power band faster. Add a full exhaust,tune, CAI and the car will be a different animal.
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Old 08-10-2012, 01:17 PM   #7
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Re: 08 GT

stock they put out about 260rwhp in the manual trans

Intake, Exhaust, Pulley, Tune you are looking at about 300~ thats not a bad way to go.
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Old 08-10-2012, 02:34 PM   #8
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Re: 08 GT

If you want hp gains, i would go CAI, Tune, and cams. Exhaust will not make real HP difference, maybe 2 or 4 if you go O/R. Exhaust is more noise.
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Old 08-10-2012, 02:41 PM   #9
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Quote:
Originally Posted by Gil_T2
If you want hp gains, i would go CAI, Tune, and cams. Exhaust will not make real HP difference, maybe 2 or 4 if you go O/R. Exhaust is more noise.
So are headers Useless?
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Old 08-10-2012, 02:55 PM   #10
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Re: 08 GT

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So are headers Useless?
If you are going FI in the future headers are not that usefull, LT's are good for 25 to 30 hp on a N/A car. The mustang stock exhaust is a very good system. You have a 281 CI engine with a 2 1/2" exhaust and the cats are like 4". If you had the cams then the headers are even better, but with the cost of headers and mid pipe, i would go cams first.
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Old 08-10-2012, 03:04 PM   #11
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Re: 08 GT

Cams aren't gonna do much without the headers.
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Old 08-10-2012, 03:08 PM   #12
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Re: 08 GT

exhaust isnt as much for hp/tq as sound, which you will want
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Old 08-10-2012, 03:12 PM   #13
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Re: 08 GT

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Cams aren't gonna do much without the headers.
So not true, that makes no sense. as long as the exhaust can handle the extra flow cams do not need headers, just ask the guys running turbos with stock manifolds.
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Old 08-10-2012, 05:04 PM   #14
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Quote:
Originally Posted by Gil_T2

If you are going FI in the future headers are not that usefull, LT's are good for 25 to 30 hp on a N/A car. The mustang stock exhaust is a very good system. You have a 281 CI engine with a 2 1/2" exhaust and the cats are like 4". If you had the cams then the headers are even better, but with the cost of headers and mid pipe, i would go cams first.
Ok I was about to say cause I'm n/a and I felt a pretty big difference with my headers plus o/r x
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Old 08-10-2012, 05:27 PM   #15
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Re: 08 GT

Cams with no long tubes and just cams is gonna be the same gain. Add LTs to those cams and you will get more gains is what I'm saying.
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Old 08-10-2012, 05:48 PM   #16
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Re: 08 GT

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Originally Posted by gqsmash View Post
Ok I was about to say cause I'm n/a and I felt a pretty big difference with my headers plus o/r x
I am not anti headers..., I have them on both of my GT's. They all so made a big difference on my daughters V6. I went with the headers first because of the cost of the axle backs. I did not want to spend 500. on mufflers then install headers only to hate the sound. I knew that i was not going to install cams on my DD, so my first mods were CAI, tune, 4.10's then headers and catted x-pipe, on the DD. I wanted the aftermarket x-pipe so just went all the way. For me the headers made the cars sound so good that I am still running the factory cat-backs on all the cars.

---------- Post added at 06:48 PM ---------- Previous post was at 06:40 PM ----------

BTW there are cams that require headers, but they also require phasers, and springs. But a cam like Comps 127300, 350, 400 and 450 make good HP w/o headers, and even more with headers. In the DD class headers alone are not as good as Cams alone.
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Old 08-10-2012, 06:19 PM   #17
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Re: 08 GT

For me a newbie to this v8 mustang world the HP #s quoted for the different basic mods that most guys install on their cars don't add up to fact or maybe I should say STACK - UP For example and Im just going to use rounded up hp#s that I have seen in an add or on a video of a dyno test of a product.
Gain cost
Axle back 10 rwhp $400
CAI w/tune 30 rwhp $600
LTs w/orx 25 rwhp $1000
UDPs 10 rwhp $200
TB 10 rwhp $300
CMDPs 10 rwhp $300

totals 95 rwhp $2800
WOW 95 rwhp for $2800 sign me up I want some but in reallity these hp#s don't stack up while each part installed on a stock car by itself you may get these gains but when combined the reallity would be closer to 50 RWHP what makes me say this is that the dyno HP#s that I have seen given by different guys on different fourms for their cars with a combonation of these mods seem to average around 310 rwhp give or take a few HP. with an average baseline stock rwhp # of 260 subtract that from 310 = 50hp

Now after the above being said and all of the above is open for debait because it is just my twisted way of thinking . Cut me some slack because Im a newbie. This is going to be MY biggest bang for the buck mod path.
1 axleback
2 CAI w/Tunner and 93oct per. tune
2 Rear gear swap 3:73 0r 4:10 still open for debait
From this point drive the car and have fun with it while I save for a Roush M90 supercharger kit.
SORRY for the long post
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Old 08-10-2012, 07:24 PM   #18
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Re: 08 GT

Axle back mite give 2HP One of the tune guys on another froum Dynoed a stock mustang with 6 different mufflers, and 1 delete on the same day. only saw 2 hp gain.
If you want the best bang for the buck, Do this find a shop that will tune you car and not make you buy the tuner. My tune guy charged me $250. He used SCT software, he stores my stock tune in case i want to go back. Start with 91 octain race. Buy a used JLT 2 CAI cost $150.00 Since you plan on FI get 3.73 gears. Pick up a used under drive pully set from someone going back to stock. All ways buy mufflers used if you must. Get a good aftermarket shifter if you are manual.
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Old 08-10-2012, 08:22 PM   #19
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Re: 08 GT

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Axle back mite give 2HP One of the tune guys on another froum Dynoed a stock mustang with 6 different mufflers, and 1 delete on the same day. only saw 2 hp gain.
If you want the best bang for the buck, Do this find a shop that will tune you car and not make you buy the tuner. My tune guy charged me $250. He used SCT software, he stores my stock tune in case i want to go back. Start with 91 octain race. Buy a used JLT 2 CAI cost $150.00 Since you plan on FI get 3.73 gears. Pick up a used under drive pully set from someone going back to stock. All ways buy mufflers used if you must. Get a good aftermarket shifter if you are manual.
Thanks for the good advice but my bad I already bought an overpriced Flowmaster Hushpower axle back and I really do want the hand held tunner not only to flash different tunes but also to check DTCs if I ever get any I can also use it to recal my speedo when I swap between my summer/winter tires etc. Plus Im looking at getting the Steeda CAI because I can use the maf section as an upgrade for the m90 kit so all I should need is a new pulley to turn up the boost.
So you think I should start with a 91 octain race tune 93 octain is pretty easy to find in my area ? I am leaning towards the 3:73 and yes I have a manual trans
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Old 08-10-2012, 08:39 PM   #20
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Re: 08 GT

only difference between the 91 and 93 tune is the timing, 91 has less advance so if you get subpar 93 gas your ok. and less timing = a little more low end power. As far as the tuner, i bought my first one and it sat on the shelve for 5 years. my 09 has never had a code. Why would you need to adjust your speedo when switching to winter tires?
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Old 08-10-2012, 08:57 PM   #21
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Re: 08 GT

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Why would you need to adjust your speedo when switching to winter tires?
This is true I was thinking different size tires would throw my speedo of but your right the OD will stay or be close to the same my bad.
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