TSD.performance

06/04/2026

We’re headed to UCC!

We want to take a minute to thank all of our customers for their continued support. Opportunities like this wouldn’t be possible without you.

We also appreciate everyone’s patience over the past week as we’ve been busy preparing for the trip. Attending events like UCC allows us to stay connected with the industry, learn from the best, and continue bringing the latest knowledge, products, and services back to our customers.

Thank you for trusting Top Secret Diesel Performance & Repair. We’re looking forward to a great week and can’t wait to share some content from the event!

📞 563-542-2980
📧 [email protected]
Top Secret Diesel Performance & Repair

We will be closed Friday June 5th!

04/22/2026

S400 Duramax L5P came in burning coolant and smoking white — traced back to a cracked cylinder head.

Repaired with a new cylinder head and ARP 625 head studs to ensure long-term reliability under pressure.

P&C Coating handled the powder coating, giving the engine bay a clean, finished look.

Upgraded with a DP Customs CCV reroute kit, AN heater core hoses, and UDT 4K+ RPM tuning!

Clean, dialed, and back on the road.

📞 563-542-2980
📧 [email protected]
Top Secret Diesel Performance & Repair

01/30/2026

🔥 BOOST SEASON 🔥
6.7 Powerstroke in the shop getting a KC Turbos Stage 1 upgrade 💨

Quicker spool. Harder pull. Better drivability.
One of the best all-around upgrades for a street-driven 6.7 that still wants to rip.

No shortcuts. No guesswork.
Diesel done right.

📍 Top Secret Diesel Performance
📞 563-542-2980
📧 [email protected]

01/27/2026

🔥 TURNED UP & HEADED OUT 🔥
L5P rolling out after a Dan’s Diesel Stage 2 64mm turbo and WC Fab cold air intake

Built to pull hard and run strong every time it hits the throttle.

No shortcuts. No compromises.
Diesel done right.

📍 Top Secret Diesel Performance
📞 563-542-2980
📧 [email protected]

12/25/2025

11/07/2025

Stock turbo just got replaced with a Fleece Cheetah drop in turbo!
Better response, more airflow, and a serious bump in performance!

Whether you’re after towing power or track-ready performance, we’ve got the setup for you.

👉 Message us to book your appointment today!

📲 563-542-2980
📧 [email protected]
🌐 topsecretdieselperformance.com

09/09/2025

2019 6.7 Power Stroke headed home after some upgrades!

✅ SPE oil pan & oil filter housing
✅ PPE deep transmission pan
✅ SPE upper & lower radiator hoses
✅ PPE intercooler

Cooling, durability, and serviceability all taken to the next level. This truck is ready for anything! 🔥

📞 Call us today to get your setup dialed in!

📲 563-542-2980
📧 [email protected]
🌐 topsecretdieselperformance.com

09/03/2025

🚨 6.7L Cummins in the shop for the BD Grid Heater upgrade! 🚨

Don’t wait until the factory unit fails and causes serious engine damage. The BD upgrade is a proven fix that keeps your truck safe and reliable.

📞 Get ahold of us today to schedule your install and protect your investment!

📲 563-542-2980
📧 [email protected]
🌐 topsecretdieselperformance.com

08/25/2025

🚨 NOW HIRING – Light Duty Diesel Mechanic 🚨
We’re looking for 2 experienced diesel techs to join the team!

🛠️ From routine maintenance to full-blown performance builds – if you know your way around a Cummins, Duramax, or Power Stroke, we want to talk to you.

💵 Pay based on experience
🕒 Full-time preferred
🔧 Must have pervious mechanic experience
🔥 Paid Time Off
👉Retirement Plan

We work on everything from daily drivers to high-horsepower builds. If you’re passionate, reliable, and take pride in your work — come be a part of a shop that gets it done right.

📞 Message us here or call/text 563-542-2980
📧 Or send a resume to [email protected]

Tag someone who needs to see this!nt

07/15/2025

🚨 NOW HIRING – Light Duty Diesel Mechanic 🚨
We’re looking for an experienced diesel tech to join the team!

🛠️ From routine maintenance to full-blown performance builds – if you know your way around a Cummins, Duramax, or Power Stroke, we want to talk to you.

💵 Pay based on experience
🕒 Full-time preferred
🔧 Must have pervious mechanic experience

We work on everything from daily drivers to high-horsepower builds. If you’re passionate, reliable, and take pride in your work — come be a part of a shop that gets it done right.

📞 Message us here or call/text 563-542-2980
📧 Or send a resume to [email protected]

Tag someone who needs to see this!