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Old 03-31-2012, 10:04 PM   #1
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HP gains

I have the SCT tuner and a CAI. I plan on getting 3.73 gears, u/d pulleys, MagnaFlow magna pack cat back exhaust, and NGK g-power spark plugs. what will these mods gain for my 04 GT?
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Old 03-31-2012, 10:29 PM   #2
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Around 40 hp I would say
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Old 03-31-2012, 10:47 PM   #3
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On the high side...tuner quotes 20 on race tune, CAI claims 10, UD just frees some up so maybe 5 to the wheels that were not there, exhaust maybe 10-15, if you did LT headers and midpipe you would get close to 40 just out of all that, gears just get you into power quicker...40 is possible just depends in how much your car pulls out of the mods-all cars are different. And we all know mods don't always give what they quote.
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Old 03-31-2012, 10:56 PM   #4
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Re: HP gains

sweet thanks
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Old 04-04-2012, 03:23 AM   #5
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Re: HP gains

Not to mention most companies measure HP increases at the flywheel, and not wheels. Some calculate in other ways, but typically when advertising, most companies don't say where they measured at. You also have to account for other factors besides bolting on parts. Although they claim to increase a certain "HP level", you have to take into account altitude/pressure/humidity, and total parasitic loss, engine wear (mileage), and various other things. Typically getting custom tunes for each add on you do is the best way to maximize each gain. I wouldn't be surprised after all that if it were dyno'd if you only gained 10-15 HP. Plugs, and half an exhaust aren't going to do much if anything without headers (best gains from LT's), and you'll need some quality COP's to make your plugs worth anything and they still may not give HP. UD pullies are only going to free up a small amount of power, not gain it, and it's typically not noticeable but you may notice that you rev a little faster. 3.73 gears won't gain you power, but you will CERTAINLY feel the effects of torque amplification. They will definately help with launching, and you'll redline faster, however, your top end speed will be reduced. Lemme know, or post another thread (or look up the hundred already here) asking about good HP gaining mods. Remember, it comes down to cost and budget as well.. and what you use the car for.
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Old 04-04-2012, 11:48 AM   #6
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Re: HP gains

true.... its a DD, a bit over 120,000 miles. I want good HP gaining mods at the lowest price and I'm not very knowledgeable on this subject, I'm just starting out lol
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Old 04-04-2012, 06:35 PM   #7
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Re: HP gains

you pretty much have the same mods as me....same car too! +1.but im gonna add headers and either an x or an h pipe w/ cats
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Old 04-04-2012, 08:23 PM   #8
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Re: HP gains

yeah i was looking at a magna flow catback exhaust next, and some gears and u/d pulleys
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