OK I got plans do a complete intake-exhaust upgrade.

I plan on doing the Injen CAI, GM headers, downpipe with CAT, and GMPP Performance Cat back exhaust.

What kind of HP gains can I expect from this kind of upgrade on adverage.

 

edited 20~30 probably.

 

might help if we knew what kind of car you had.... i'm guessing about 15ish on a 2.2 or 2.4.... maybe 20ish on an SC.

 

Lets see this is posted in the 2.2 section....So take a wild guess....

 

nah I think the gains would be higher than 15. 24ish on a sc is just intake+exhaust that doesn't include header or downpipe. lemme retract what I said and say something between 20~30 for all that stuff.

 

Thats about what I was estimating...

 

Dayum....so about $600 for 20-30hp...that's a rip off. lol

 

lol no it isn't thats a decent gain for the price and the car will sound nice with it all installed.

wanna play gotta pay

 

are you speaking peak or average?

i'm thinking that if you move your power curve up 10-15hp on the entire range, that's approx right for all those goodies. really, that's a 10% increase in power, that's a lot for a modern 4 cylinder with bolt ons.

 

im saying peak

 

20 i MIGHT believe peak... 30 would be a hell of a lot. that's almost a 21% increase in power peak. i don't see that happening. the ECM would have a fit if it was that far outside of the baseline...

 

with GMPP its a 4 hp gain. header maybe 5. id say u will gain about 18 whp

 

How much more hp gain would you see in a 2.0 compared the 2.2?

 

with full exhaust stuff you'd see more around 15, but with intake stuff done youd see probably arouind 20.

 

Well the 2.0 is blown (obviously) so you are going to see higher gains from intake/exhaust mods most likely. This is unless the 2.2 has a very restrictive exhaust and intake.

 

with sri and catback exhaust they have been getting 14-16fwhp ...header it will be around 19-21fwhp gain....so about a 25-30hp gain at the crank or so

 

8cd03gro...the stock intake and exhaust is very restrictive on all the models...the stock exhaust mani sucks...on the 2.2 the exhaust goes from 2 inch all the way down to 1 inch and 3/4 when it starts the bends at the back of the car.....and the 2.0 goes from 2 and half down to 2 and 1/4 at the bends...not sure about the 2.4 but it should be close to the 2.0's size

 

it'll be more than 600 dollars for all that. your looking at atleast 400 for the catback 200 for the header 100 for the high flow cat and about 250 for the intake. so theres 950 right there. but even 950 is decant for 20-25 hp. think of the turbo it'll add about 100 hp but thats 4k so about 25 hp per 1000 dollars. not a bad price if you ask me.

 

Yeah the turbo is def something I am looking at for the furture...but before I even consiter a turbo there is a ton of engine work that needs to be done....Thanks for all the input guys.

 

All this horsepower guestimates is pointless and could be disappointing when you actual find out how much power you actually gained. Modifications don't add and subtract like math (example: Intake...5 HP + Exhaust...10 HP = 15 HP). A modification changes that area and either works with what you changed or doesn't work with what you changed whether it's the motor not liking it or the computer not liking it or whatever reason. Same thing as people who put turbochargers on their cars but don't tune their vehicles...they might expect 80 HP gain but they could honestly be gaining 25 or 30 HP cause they aren't tuned correct enough...in this case, the computer or fuel system isn't agreeing to his modifications.

Long paragraph, I know but hopefully you guys understand what I mean. Just a word from someone whos been modifying for a good while and who has been there and done that:

Get a base dyno, modify, get another dyno...that will show your real gains and results. Guessing will just lead you no where.

 

if you gain 20-30HP from a 2.2 with those mods you better jump up and down and pray to the heavens.

bolt ons = **** for gains

 

Basically...

What people have to understand is that you're gaining power from unrestricting airflow and exhaust flow. Well being that you have 4 cylinder motors, they don't draw much air in, so putting an unrestrictive intake on will do little. Being they don't draw much air in, they aren't going to push much exhaust out, so your small stock exhaust system being replaced isn't that much of a gain as well.

Now bigger motor'd vehicles will experience bigger gains cause they draw more air intake in and especially if they have stock restrictive intake and exhaust systems. Example: My car, 06 Eclipse 3.8 V6...the stock intake is very restrictive cause of it's design. People have replaced them with "Cold Air" style intakes and they've gained from 15 WHP+ just from that alone.

The key thing is to raise the amount of air that is entering your motor so you can spray more fuel to cause a bigger explosion in the combustion chamber. This is why people go with boost and don't even bother with "bolt ons". Honestly, if you're looking for big gains with bolt ons, than you're going to be dissapointed. If you want big gains, you're going to have to either do some engine work or boost or both.