Anyone do this? I want to but in not sure if its worth it.

Thanks

 

Search around on cobaltss.net

 

there was a thread on that one done some time ago. from what i understand may not be too much worth it. if i remember correctly, felt the power more at higher RPMs.

 

Yeah I think its one of those things that doesnt make a big difference on its own. If you are going for max performance though, its just one more step towards the goal.

 

https://www.chevyhhr.net/forums/2-2l-performance-tech-5/new-performance-mod-2-2-enignes-9778/ is the big thread, but there are a couple more. The runners look to be shorter as well as fatter (the 2.2's manifold runners loop a little further around the plenum), so you'd expect that the gains are going to be all at the top end, but it seems that it's a measurable improvement, and not too difficult or expensive.