wel even after havig xpipe and cat back with a cai, and 3.73 gears with a sct tune. I still want more the car is alot funner to drive now and pulls hard specialy in 2nd gear. but would like to see another 25 hp and 20 ftpds of torque. thinking of plenium and throttlebody upgrade with spacers. and maybee under drive pulleys. But I've heard that underdrive pulls will not produce enough for the alternator or water pump. and that aftermarket thotle bodys sometimes stick open. is any of this true. and if i did do the pullies or thotlebody which ones to use. and will it get me the 25 extra hp im looking for or even close. and what would. with out nitros or supercharger. just want a little more and keep the n/a. al off this just so i can stay with my buddies 2005 gto when i first got the car he babyed his car but still beat me. after i found out he babied it he sayed he did not want me to get disapointed. so then we retried with just the exhaust and cai on mine he slautered me. so i did the gears big diffrence but he still puled away but not as bad. then i did the sct tuner and from a dig he only pulled ahead by a 3/4 car length but by 3rd gear and 75 mile an hour he started to pull away more. from a rolling start about 35 mile an hour. we stayed pretty close but at 80 he pulled away. so i figure 25hp and 20ftpds of torque would make a closer race. even it up a little

I know what you mean. I raced a GTO a few days ago and got pwned. I can't figure how to put my cars pic on my post. But I have a few aftermarket things but nothing much to brag about. The guy driving the GTO said he was just playing with me. I know his car had 400 horses and 13's in 1/4 mile. I think I will by a s/c nxt.

Well an intake spacer is good for up to and including 0hp, so im sure that will help you see how helpful that mod is. :D

TB and plenum is more for looks and throttle response, and helps flow at higher rpms. Honestly you might see 5rwhp from it.

Underdrives make it so that your car isnt wasting power by overspinning the waterpump and alternator. You're not exactly adding power, you're freeing power up. Expect anywhere from 5-10rwhp from underdrives.


Basically those mods wont get you the power you're looking for. I say trade in your x pipe for a shorty X, and get yourself some longtube headers. With full exhaust, you might see about 25-30rwhp gain. Exactly what you were looking for.

Our motors wont see much from bolt ons. Our 2V heads dont flow well enough. If you want big power, you're better off with nitrous or FI. Or you could just save up for a better motor. :D

My friend has stage 2 heads and cams. As well as full exhaust. Odds are hell be at about 300rwhp just from that setup. And any other bolt on he does will net more power than on a stang with stock heads, because the stage 2 heads flow better.

i'd go for a electric water pump before UDPs and supposdly with full exhaust its more like 10-15hp

ORIGINAL: avlon06

i'd go for a electric water pump before UDPs and supposdly with full exhaust its more like 10-15hp


Ive heard as low as 15 and as high as 30, so the numbers are all over. :D If you have a stock intake setup, and better flowing exhaust, then you arent taking in enough air to make good use of the freer flowing exhaust. Now if you had combined a CAI, tb and plenum, maybe a better intake manifold, with the full exhaust, youd see a better gain. But all that air still has to go through those ****ty heads. [&:]

Electric water pump is kinda expensive for the little power youd get tho, wouldnt you say?

Cams will do the trick! :DStage 1's if you wanna keep stock valvesprings, Stage 2's if you don't mind upgrading valvesprings.

^I like the way that guy thinks. :D


But if you DO go stage 2 and you have to upgrade the valvesprings, you're better off buying better heads that already have all that done. My personal opinion is that heads and cams are a package deal. You do em together to save time and money and get the most power at once. Do it once, do it right.

Ive been thinking of heads and cam combo but realy did not want to start messing with the inside of the engine. since its my daily driver. and want to keep it reliable. and if i do the heads. what is the diffrence from are 2v engine and the new 3v engine can i just swap out and go with a 3valve head and new intake manifold or is it more than that

+1 for longtubes. cams or heads if u dont mind tearing into the motor a bit. remember with heads and/or cams your gonnawant a dyno tune (i'd rather get heads before cams anyways)


tb+plen and pulleys are a waste of money. youll probably see 5-10rwhp from 600$ worth of boltons like someone else said.

Also by the time i change the heads and intake plus installation. probably cost the same as a supercharger install. Steeda who does all my work for me said around 7500 for a supercharger and installation. that would definetly do the trick but i want the engine to last. and i wonder for that much or little more could i find a cobra motor for my year 2004. and would not have to worry about the bottom end

No you cant swap the 3v heads onto the 2v block. They wont fit. Nor will the 4V heads. The max you can go on the stock block is stage 2. Stage 3 valves are bigger and will hit the cylinderwall on the stock block, you'll have to get a new one.

mezier electric water pump, and a dyno tune should net you another ~20rwhp. If that not enough, look into cams since the rest of the boltons don't do hardly anything. You've got the big ones (mid-pipe, catback, and tune). If you still want more power after that, then look into cams and heads if you have the money (notice the cams first). I would definitely not even think about getting ported heads without cams to match or you'll be sadly dissapoited by the gains.

I told ya'll this sh*t was addictive [sm=signs007.gif], now we have another guy bitten by the bug. Now you really need to sit down and be realistic about what you want to do in the future. Many will say s/c, but it's hard to find 5k just lying around the house. You wanna stay n/a then get a set of Fox lake or Patriot Heads and get some cams with a custom grind. There are many routs to take and it all cost $$$$$$$$$$$ so make up your mind and get busy

ORIGINAL: 02 Ninja

I told ya'll this sh*t was addictive [sm=signs007.gif], now we have another guy bitten by the bug. Now you really need to sit down and be realistic about what you want to do in the future. Many will say s/c, but it's hard to find 5k just lying around the house. You wanna stay n/a then get a set of Fox lake or Patriot Heads and get some cams with a custom grind. There are many routs to take and it all cost $$$$$$$$$$$ so make up your mind and get busy

Sorry noob here, what do you mean custom grind on the cams.

ORIGINAL: GStam66

No you cant swap the 3v heads onto the 2v block. They wont fit. Nor will the 4V heads. The max you can go on the stock block is stage 2. Stage 3 valves are bigger and will hit the cylinderwall on the stock block, you'll have to get a new one.


Why are there people out there with 3v and 4v head swaps then? It might take a little work, but it definitely can happen. But if you ask me its not worth the time or money since for much less trouble and for probably less money you can just buy a blower and push more than a NA 3 or 4 valve.

well a supercharger is the way to go I guess. It would be nice to just skip all the little 5hp here and 5hp there stuff and go to around 100 hp more. I'm just worried that I wil blow my engine a year down the road because its to much. and what about gas mileage what is the change on mile per gallon. But if I decide to do supercharger. I will first beef up suspension and brakes. to handle the extra 100hp.

ORIGINAL: dh04 red gt

well a supercharger is the way to go I guess. It would be nice to just skip all the little 5hp here and 5hp there stuff and go to around 100 hp more. I'm just worried that I wil blow my engine a year down the road because its to much. and what about gas mileage what is the change on mile per gallon. But if I decide to do supercharger. I will first beef up suspension and brakes. to handle the extra 100hp.


F/Iis the way to go. No need for the suspension or brake up grades either, unless you plan on driving (honestly) likea complete maniac. Besides it can handle 8-10lbs of boost safely. Anything more than that and you would need to do some internal forging.

If your going to get gears with the S/C, go with the 3:73s. Any higher than that and your tires will spin a lot.

If you plan on getting a S/C, save, save , save your money. It'll be worth the wait ;)

thanks for the info. and I already have 3.73 gears. But I alwayes was lead to beleive and still do that before adding that much hp upgrade braking and suspension not tring to drive like a manaic. but why supercharge if your not going to get on it every now and then

Custom grind cams basically means you call up a cam company, tell em what mods you have/plan to use with the cams. And ask em to "custom grind" cams for your car, that would give you the most power. Hence custom. :D Made specifically for your cars mods.

ORIGINAL: tbirdscwd

ORIGINAL: GStam66

No you cant swap the 3v heads onto the 2v block. They wont fit. Nor will the 4V heads. The max you can go on the stock block is stage 2. Stage 3 valves are bigger and will hit the cylinderwall on the stock block, you'll have to get a new one.


Why are there people out there with 3v and 4v head swaps then? It might take a little work, but it definitely can happen. But if you ask me its not worth the time or money since for much less trouble and for probably less money you can just buy a blower and push more than a NA 3 or 4 valve.



Well its not JUST the heads they swapped, they would have had to do an entire motor swap. The 4v block is different than the 2v block. 4v heads will not fit on a stock 2v block.

Late to comment- Stay n/a since that's what you really want. Longtubes with shorty x pipe. Then do an intake manifold with t/b and plenum. All that should get you about 30-40 rwhp.

Yeah but then when he wants even MORE power, to beat the next fastest car, all hell have left that would be worthwhile are heads and cams, really. :D Might as well wait on the headers till he gets the newer, better flowing heads, with a nice set of cams. Then slap the headers on and call it a day.

LIke he's gonna beat a GTHO with his listed mods, And all he has to do is add longtubes and a shorty X and hell be whippin there ass... I hope thats not what your sayin