You're not ready for an IC yet. Headers are first on the list, and if you're comparing yourself to GTP'*, you can give that up now. Damn the similarities, the Bonneville'* PCM is quite different. This cause unique differences, and this is why INTENSE is the best PCM option off the shelf. They specialize in the Bville PCM, where other vendors could care less, and simply state that it'* another L67.

Isn't the main difference with Bonnie pcms just more torque management?
And can't that be tuned out?

:?

I just wanted to say I got got a SS Plog and it is super nice quality, very nice welds. It'* a little close to the a/c compressor for my liking, but it does not hit. They might have been better to start about 1.5" under the #1 cyl and neck up to 2" where the #3 tube comes in, that would have given more a/c comp clearance, but hey, what more can you aks for for 175-bucks? It'* very nice. It has turned a cool shade of blue-ish gunmetal after about a day of driving. It installed in less than 30 minutes.

I woudl recommend one to anyone over the stock manifold. I was skewing the rear 10% (adding fuel) to even out the engine with the stock manifold. Now I am down to only 5% and only on #2 and #4 (I have a rear header for the turbo, so it'* different than the stock L67 skewing requirements) In other words, it works nearly as good as my custom rear header.

One thing I noticed, I get a weird "waa-waa" exh harmonic from 2500-3000rpm. It started after I installed the plog. It might have been due to the 10% rear skew, which is much less now. I will listen close tonight on the way home to see if it went away.

Plog = Good money spent!