Originally Posted by mc1978

That settled it for me as I have a 2005 Monte Carlo LS with the 3400. I was thinking of going with PEMs from MMS as well. The information here solidified that decision.I believe that they will bolt right up to my stock downpipe. I am going to be getting an exhaust for the car after I get my taxes back. that will consist of a Magnaflow catalytic converter, resonator delete, split to dual, Flowmaster Super 44 mufflers, 3" tips.

Originally Posted by bumpin96monte

Just curious, have you seen dyno results on 3400 PEMs? That front manifold looks horrendous if the picture I found was accurate.

I'm just not familiar at all with the 60* engines and would hate to lead the OP to waste money on something that doesn't have verifiable gains.



Did you happen to dyno before/ after - or determine a cause? I know there were people that ran into that kind of stuff in the early 3800 NA modding too. Some of the stuff would pick up power way up at the tippy top but tank it everywhere else and end up with a negative average.

You'd think some type of header would benefit the 60* engine as you can actually get scavenging benefits unlike the oddball firing order of the 3800. Curious if they were designed poorly (primaries too big, too short, etc).

Originally Posted by wht02monte

Anyway, within a couple days I welded a turbo to the front header, didnt tune it, blew it up and junked it.