Twin Cities Performance

09/04/2026

First time running the new BTR canted valance cathedral port heads and very happy with the results.

These heads are beautiful pieces and overall fit, finish/quality of the heads. The decks are massive, machining is very, very clean.

This car originally came to us a a bolt on LS1 that made around 350whp. The current setup is an LS2 aluminum block based 39x cid 12:1 compression ratio with BTR 400+cid camshaft(236/25x, 636/636 114lsa)

We ran the car a few days ago with the PRC stage 2.5 243s. It made identical power to when we built it last fall, 513whp and 468ft/lbs.

We then swapped just the heads and reused (without any port matching) the Fast intake. It should be noted that port alignment is not great and we are pulling the intake now to address that. But we wanted to get an accurate bolt on change. The old setup had a .045” thick gasket and the new setup we dropped it to a .040. The old heads were a 62cc chamber and the new heads are 61cc.

Results:
Red line - baseline with PRC head
Green line - ran hot BTR CV head
Blue line - Engine cooled BTR CV head
Yellow - ran hot BTR CV head w/bellmout

So straight back to back results (red vs green) were an honest 30whp!! I would have been happy with anything over 20 so I was ecstatic to see 30 wheel.

We will likely be port matching the intake and building a proper 4.5” intake with hopes to make around 560whp na with under 400cid.

**Dyno Video and idle video in the comments**

Brian Tooley Racing
Brian Tooley

08/12/2026

We have been getting s**t about not having more cam chop videos so here ya’ll go. We will start posting more videos in the future as well. We will start with one we finished up yesterday.

***more vids and pics in comments***

17 SS A8
Long tube headers
Flow FX rear section
Gwatney Performance Innovation SS3 camshaft

07/30/2026

As soon as we heard HP Tuners had unlocked the T46 for the TR9080 transmission we pulled and next day shipped our TCM in for unlock service. We have been working with different transmission calibrations and have found a really nice combination that is allowing us to get quick/clean shifts at 750-800whp. There are still a ton of tables yet to be defined but the improvements in shifting over where we were with the stock TCM and pressure controller are night and day.

This car is still 100% stock other than the turbo kit and PCV routing. We are on a blend of 110/premium fuel and right at the limit of the stock fuel system so this is as hard as we can currently push. Right now we are at 9-10psi and these Garrett G35s are just getting started. In the next month we will have port injection/more low side fueling on it we we can lean on it more we continue to develop.

**Of course we are at the limit of the stock motor and are willing to accept the consequences. When you own your own test cars it really helps with getting aggressive. After we finish up this year the engine will be coming out for something much more robust. Until then we are going to keep squeezing until we find the limit.**

Additional testing and 60-130 runs will be coming shortly. The car will be at Powercruise USA this weekend which will be a great endurance/torture test. As long as everything stays together and keeps working like it should we would be happy to give rides.

801whp C8, Huron Speed Twin Turbo kit w/Garrett G35-900sCompletely...

07/14/2026

Keeping the C8 train going. This car already came in with a few bolt ons already, but got almost everything else to make it a max effort SBE set up. This was the most recent heads/cam car we just wrapped up. Except this one got a little extra flair to it. Fitted with a twin bottle, direct 8 port injected, NO2 system by Nitrous Outlet that’s controlled without any standalone ECU’s! This was something our customer requested, as NO2 isn’t our traditional route, but it sounded fun and figured if we’re going to do it we are going to do it right! It’s only on a 100 shot for now, but there are bigger plans to come with this one in the future.
Here’s the details:
- GPI - Gwatney Performance SS3 camshaft
- GPI - Gwatney Performance ported/milled cylinder heads
- Brian Tooley Racing valve springs/pushrods/dfm plugs
- Cometic Gasket MLS head gaskets
- Performance Design carbon pTR intake manifold
- Chevrolet Performance LT5 throttle body
- Nitrous Outlet NO2 system
- DSX Tuning flex fuel kit
- Mightymouse Solutions
- Eventuri carbon cold air intake
- Kooks Headers and Exhaust
- Twin Cities Performance custom dyno tune via HP Tuners
Car made 544whp & 486wtq on E85 motor only, and 645whp & 585wtq on NO2.

07/08/2026

With the good news of TCM tuning now being available for the C8 platform, here’s a heads/cam car we did over this last winter. It was tailored to be a daily driver with calm manners but to have a presence when pulling up. See idle video and dyno graph at the end. This car turned out awesome! Overall is a great build for anyone looking to enhance there C8 Corvette, maintain stock drivability, but pack a mean punch behind the throttle!
Fitted with:
- GPI - Gwatney Performance SS2 camshaft
- GPI - Gwatney Performance ported/milled LT2 cylinder heads
- Brian Tooley Racing valve springs, pushrods, and dfm plug kit
- Kooks Headers and Exhaust long tube headers w/green cats
- Valvetronic Designs Exhaust Systems titanium valved cat back exhaust
- Halltech Systems, LLC cold air intake system
- DSX Tuning flex fuel kit
- Mightymouse Solutions catch can
- Twin Cities Performance custom dyno tuning thanks to HP Tuners
Final numbers were 536whp & 482wtq on E85 (red line on graph is pump gas)

07/07/2026

Its official, things are going to start getting real for the C8 platform!!

07/06/2026

Would like to introduce the TCP community to Chase and Lex’s beautiful baby girl Billie Holiday Billich!! Everyone is healthy, happy and we know these two are going to be amazing parents!!

06/18/2026

Finally a sunny day! Happy Thursday y’all, nothing hits quite like a C6 ZR1. Such beautiful cars.

This one came in for general inspection, found cracked intercooler bricks along with a mess of other things. Made 610whp on the baseline pull and is leaving at a pinch under 750whp after getting sorted and dialed in.

05/14/2026

Good people know good people!

Our crew over at Lancer Service is looking to add another technician to the team. If you’re someone who takes pride in your work, wants to be around a great group of people, and is looking for a long-term home — this is a great opportunity!

Know someone who’d be a good fit? Send them the original Lancer Service post shared here and have them email [email protected]. And did we mention, Lancer is offering a $250 referral bonus if your referral gets hired!!

🚨 We’re Hiring! 🚨

Lancer Service is looking for an experienced Automotive Technician to join our team 🛠️

We know great customers know great people — so we’re asking for your help!

👉 Check out the full job posting here:
https://www.indeed.com/job/automotive-technician-963e31fbfef0d4cf

💥 Know someone who would be a great fit?
Refer them to us! If we hire your referral, we’ll send you a $250 thank-you bonus.

No catch — just our way of saying we appreciate you helping us find the right person.

04/30/2026

Brian Tooley Racing Stage 3 LS3 cam is awesome.
-490whp 440ft/lbs *Power everywhere*
-Great chop
-Drives like stock

Simple intake, header, cam combo!