Does anybody have pics of some 93-95 PEMS? I was thinking of getting some for my 93 L67. How much larger in diameter are they? Looking at the manifold, it looks like there isn't much more room to go bigger without making them weak.

You don't 'buy' them. You get another set and have them stitch-welded around the outside (by a GOOD shop that knows how NOT to warp them), then grind out the OEM weld that restricts the INSIDE of each runner. You have the same shop fix the cracks (you have them, trust me). Then you coat them if you like before or after install.

You can gain 15-20% flow this way. A very few of us have already done this. I did my own, and if you do a little searching here, you'll find the topic.

Can you put your year/model in your signature so we know what you have the next time you post?

Click on PROFILE on the top menu bar.

Oh, is that all that'* done? In that case I may build a torque plate and do my own. I was under the impression that an aftermarket company was somehow enlarging the runners or something. Thanks.

Here'* a few pics of a couple sets I've had done:

Set for my old 1995 SLE SC (light grey ceramic coating):







Here'* the set I recently had done and sent to J Wikoff (coated with light grey ceramic, then dark grey ceramic over that):

Marty, this pic looks horrible. Do all the ports look that bad? Is this the same vendor that produced the PEM'* that Matt got?

Sailor, I don't know what you have planned, but I can tell you it'* going to take ALOT of work to outflow a set of ported S1 L67 EM'*.

Trust me. You don't need major changes.

Thanks for all the help guys. I can see how that would improve flow. You guys here on BonnevilleClub are great. I don't hang around ClubGP much anymore because of all the idiots over there. Plus, tuning a Series 1, which is new to me, is totally different and really exciting.

Willwren: You bet I've got cracks! Driving the Buick Park Avenue (parts car, for the engine) home I didn't hear anything, but when I removed the manifolds I found a bunch of them.

We tell everyone they have cracks. The 2% that don't never get pissed.

I'm running perhaps the quickest non-nitrous S1, and my PEM'* aren't holding me back. We'll see what spring brings. 50hp more going in.