I am curious, will the intake manifold and exhaust manifold fit onto a 2003 Sunfire with Ecotec?
I know some changes were made from the 03 like the throttle cable and such, but I am not sure if the intake and exhaust manifolds fit.

Also, is the 07 intake and exhaust manifolds better than the 03 in any way?

I might port them out a little and pop them on the wife's Sunfire is why I ask.

Thanks guys...

are you referring to cobalt parts? intake, i done know, exhaust, yes, I did it, used an lsj manifol WAAYY better than the stock L61 manifold I even ported it out, you'd be best off having a cusotm down pipe made to go with it though 2.5" I have the ported LSJ manifold still hit me up if you want to buy it

porting a L61 mainfold = not worth it. not much you can do there is a D shape in the opening that cant be ported round because there is no extra material present on that side of the manifold the whole thing inside and out kind of has a D shape to it, very stupid design no idea why GM did it

So the L61 motor is what they call the Sunfire/ Cavalier 2.2 Ecotec, and the LSJ is what they are calling the Cobalt's 2.2 Ecotec motor?

Or is the Sunfire/ Cavalier L61 the same motor, and has the same exhaust manifold as the 07 Cobalt?

the LSJ is the 2.0L Supercharged engine found in the Cobalt SS/SC. The L61 is the 2.2L engine found in the "Balts and is also the engine you have in ur Sunfire.