Here is a formula for a cheap 25 WHP and 20-25 WTQ over stock.

1 : 3.0" pulley. You have the choice between a modular one or a plain one (look like stock). Here is one cheap suggestion (among others) if you don't plan to upgrade to a even smaller pulley later :

http://www.zzperformance.com/cobalt_...c5fee86507f6fa

You can also run a 2,8" pulley if your car is a 2004 or 2005. With it you'll nead a bigger tensionner pulley or an adjustable belt tensionner arm.

2 : Replace your stock muffler with a 2.5" straight through design. Here is one suggestion (part #14326) :

http://www.magnaflow.com/02product/s...ne=main&id=350

3 : Install a manual boost controller (just splice the vacuum line between the electrical by-pass valve selenoid and by-pass valve actuator's lower nipple. Set it at 15 PSI; this way you won't be too lean for the last RPM's and won't get too much knock. Here is a suggestion :

http://www.boost-controller.com

4 : Upgrade to one step colder NGK BKR7E plugs gapped roughly to 0.030".

Total price : roughly 200 $ for the parts, and a couple of hours for the installation.

Have fun !

 

exlpain on that boost controller man. isnt that the same as the boost mod.

 

I thought running a 2.8 pulley will run the car too lean at higher rpms?

 

thats what the boost controller is for

 

Um aren't boost controllers for turbo applications only?

 

No they are for any car that needs to "control" "boost". Get it

 

im definatly going to get a boost control inline instead of capping of the bypass line

JMC- how much can you really do with the AFC2.2, was looking at picking one up but didnt know what else would come out later down the road

any thoughts...deal or save my money?

 

It's not the same thing dude. The boost bypass is giving you more boost while the boost controller is limiting your boost

 

What is that muffler going to do besides make my car sound more ricey...and how hard is it to install, i dont see how ill gain power?? (not being a dick) just wondering?

 

im gonna plug it inline with the bypass hose
when solinoid open functions like stock, closed solinoid will vent

i could do it with a t fitting but want the psi in the vacuum line to be able to vent to Atm.
whith the valve shut

-----!<- - - - -
, ,tryed to draw it out, not easy @ 1am

 

well here is some good info on that. i dynoed my car with a 3.0" pulley, drop in air filter and muffler swapped with a dynomax. and dynoed 10hp more than my friends cobaltss and he had a 3.0" pulley full CAI oh yeah both had the bypass mod done. so switching that muffler out will def. help out. both dynoed at the same place back to back.

 

Draw me somethign out in paint. I wanna play with this.

Dan

 

https://www.cobaltss.net/forums/2-0l-lsj-performance-tech-47/manual-boost-controller-mbc-cobalt-ss-13382/