I just threw in a Lingenfelter Performance Engineering L210170000 160 Degree Thermostat for like $30. Honestly, it kept my temps way lower during summer cruises without breaking the bank. Best budget mod I've done, tbh!

I went through this last year. honestly, i'm pretty cautious with my LT4... i started with a Green Filter 7306 High Performance Air Filter and then added Tapout Tuning LT4 Thermal Reduction Plates. it basically isolates the blower from head heat. over the years, I've tried many setups and focusing on cooling first is way safer than just chasing boost numbers. maybe look into those before going full build... gl!!

So, i've spent a crazy amount of time looking at the market data for the LT4 platform. Honestly, while everyone jumps for boost first, I’m a bit more cautious about heat soak and long-term reliability. If you want that refined feel without going overboard, here is what I recommend after my research:

* Eventuri Cadillac CT5-V Blackwing Carbon Fiber Intake: It’s pricey, but the engineering and airflow data are legit compared to cheaper open-box kits, and it looks sick in the engine bay.
* Weapon-X Motorsports LT4 Supercharger Cooling Lid: This increases plenum volume and cooling surface area, which actually helps with throttle response and heat management.
* Cordes Performance Racing CT5-V Blackwing Expansion Tank: Adding more coolant capacity is a safer "bang for buck" move than just a thermostat.

Basically, you gotta be careful with tuning if you want to keep that daily drivability, you know? Always consult a pro before changing boost levels so ur not risking that LT4... better safe than sorry! gl!

> "I’m looking to see what the community considers the essential first steps for performance gains... I’m also curious if anyone has explored thermal management upgrades, like a larger heat exchanger"

Honestly, I get the itch to mod, but maybe slow down a bit lol. I started with the Roto-Fab Big Gulp Air Intake for CT5-V Blackwing because everyone said it was a MUST, but tbh it was kinda a letdown for the price. The supercharger whine is wayyy louder, which is cool, but the actual butt-dyno difference was barely there for $600.

If you want REAL power, you gotta do the pulley, but thats where things get messy. I went with the GripTec 2.30 Upper Pulley for LT4 and while the boost is insane, the heat soak is LITERALLY the worst part of this car in the summer. Its so disappointing when you spend all that money and the car slows down after one pull...

I basically ended up needing the Kong Performance CT5-V Blackwing Heat Exchanger just to keep the car from pulling timing. It was another $1,000+ that I didnt really want to spend, but without it, the pulley upgrade is basically useless once the engine gets hot. For tuning, I used the HP Tuners MPVI3 Diagnostic and Calibration Tool with a remote tune. It works, but honestly, the 10-speed shifting felt a bit jerky at first... not nearly as refined as the stock Cadillac tune. If youre looking for the best bang for your buck, maybe just stick to a drop-in filter and the cooling mods first? The LT4 is already a beast and chasing that extra 50hp gets real expensive real fast... anyway, gl!

To add to the point above: definitely agree that keeping things cool is the best move! I did some of the work myself in my driveway last weekend and it was actually pretty fun. There is something so satisfying about working on your own Blackwing... its just such a beastly machine!

• get a good set of trim tools
• watch a few videos before diving in
• maybe have a buddy help with the heavy lifting Honestly i got so distracted cleaning the wheel wells while I had the car up on jacks that I almost forgot to finish the actual job lol. Im totally that guy who spends more time polishing the exhaust tips than actually driving some weeks. I even started looking at those high-end ceramic coatings for the calipers because the brake dust is just unreal on these cars... anyway. But yeah, cooling is definitely the way to go first!

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