[NA18CamaroSS]

Back in late January I finally installed headers on the car. I opted for the American Racing 1 7/8" long tube headers, X-pipe and exhaust mated to the stock NPP muffler. I took the car to Superior to see where the car was at: it made 459 torque and 463 HP--down from 469 torque and 479 HP that the car made in June of 2020 with the stock exhaust manifolds and NEW Era cat deletes. Needless to say I was a little disappointed.
I decided to take the car to Church Automotive Testing to get retuned for the headers and exhaust. The car made 518 torque and 508 HP, but Church's Dynapack reads much higher than a dynojet. The tune was awful. I had a check engine light as soon as I restarted it after stopping for lunch on the way home. The next morning the car barely ran for the first couple of minutes until it warmed up a little. I contacted Church, and after a couple of weeks I got a refund for the retune.
Next, I installed an AEM wideband so that I could tune the car myself on the street. I trashed the Church tune and went back to my previous tune. After a couple of weeks playing around with the full throttle stuff and fine tuning the MAF I was pretty happy with the way the car was running. But-there's always room for improvement.
I contacted Pray Performance and payed for his remote tuning services. I just got his basemap and I decided to hit the dyno to see how much power the car is making and to compare the different tunes. The Church Automotive tune made 456 torque and 461 HP-less power than the car made untuned. Then I loaded my street tune and the car made 471 torque and 472 HP. 15 FT-LBS and 11 HP better than the Church tune. Finally I loaded the Pray Performance basemap and the car made 471 torque and 472 HP--almost identical to my street tune and Pray has not even dialed the tune in yet. Once pray has fully dialed in my car I am going to head back to the dyno to see what's what. Chart:

[AceSam07]

Wow you guys are getting amazing numbers. I went down to Church's and got a baseline pull when i had the gm CAI with no dealer tune or anything and got 396whp and 417wtq. Now i have a full exhaust (Kooks long tubes and 3" pipes), GM CAI, Flex-Fuel kit, and waiting on C8 manifold to come so i can get it all tuned at once. Hopefully i can get to about 500WHP.

[NA18CamaroSS]

So we have been chasing the power we had before the headers and exhaust were installed. The ATI 10% underdrive pulley got us back up to 480 HP. Finally! Pray Tune.

[NA18CamaroSS]

Quick update. Installed an MBRP axle back to see how much power the stock NPP muffler was costing me-it turns out not much. ~ 5 HP.

[ggaites]

I very been researching the LT2 manifold and reading about it and the MSD etc. with a 95mm throttle body. I am surprised it is not part of your setup. Sounds like Pray is reliable for remote tuning. Anyone know about GPI? I think I’m ready for some bolt-ons...

[Essmotorsports]

Originally Posted by ggaites

I very been researching the LT2 manifold and reading about it and the MSD etc. with a 95mm throttle body. I am surprised it is not part of your setup. Sounds like Pray is reliable for remote tuning. Anyone know about GPI? I think I’m ready for some bolt-ons...

Do it!
Definitely makes car more fun!

[NA18CamaroSS]

Originally Posted by ggaites

I very been researching the LT2 manifold and reading about it and the MSD etc. with a 95mm throttle body. I am surprised it is not part of your setup. Sounds like Pray is reliable for remote tuning. Anyone know about GPI? I think I’m ready for some bolt-ons...

I am running the MSD intake manifold ported by Pray and a Nick Williams 103 MM throttle body. I don't know if I have posted that info in this thread.

[NA18CamaroSS]

We got a set of heads ported by Brett at Pray Performance and installed them on the car. Did some tuning touch up on a Dynapack dyno, mostlyA/F adjustments. Took the car to a local European shop that has a Dynojet to see where we are now. Car is making 496 WHP and 487 torque now (SAE). Stock cam and stock bottom end, as well as the stock exhaust manifolds.
Current mods list:
RotoFab dry, Nick Williams 103 MM throttle body, Pray ported MSD, Pray Stage 1 ported heads, flex fuel kit (ethanol content of the local E85 is about 79-80%), stock exhaust manifolds, New Era cat deletes to stock NPP exhaust (with Holley crush pipe deletes).
Pretty happy with the car; it's very fun to drive.

[NA18CamaroSS]

Finally got the car on a Dynojet for final numbers with all of the mods done. No further mods planned. 534.84 horsepower/449.68 torque. A little hiccup at 6,000 due to the torque management pulling 11 degrees of timing. The stock cam did not have this issue-I guess that it's making too much power. LOL. The issue will be sorted out shortly. But the overall results were not affected. Brief summary of mods: Rotofab, Pray ported MSD IM, Nick Williams 103 MM TB, Pray stage 1 ported heads, Kooks 1 7/8 " Long Tubes, Stock NPP muffler, BTR 220 Cam with all of the supporting hardware (springs/retainers/DOD block off/4 degree cam limiter), E85.

[BSV-CamaroSS]

Very nice numbers. I am getting ready to install my Mamo ported MSD, NW 103 tb, and a ATI 10% UD pulley on mine here real soon.
My question for you is was it stock heads you got ported?