We Call You Back
Within one business day, someone from the shop calls to talk through your vehicle, what you want out of it, and whether we're the right fit for the job.
Contact · Rosendale, WI
One Call. A Straight Answer.
Build quote, dyno session, tires, or a noise you can't pin down — tell us what you're driving and what you want it to do. We'll call you back within one business day.
Reach the Shop
Talk to the People Doing the Work
No call center, no upsell script. The same crew that builds twin-turbo stroker engines answers the phone at WSP.
Call the Shop
(920) 579-0605Fastest way to reach us — especially for towing or time-sensitive repairs.
Hours
Call ahead for current shop hours — (920) 579-0605.
Follow the Builds
Facebook — @WiscoSpeed
Instagram — @wiscospeedandperformance
Dyno Day dates are announced on Facebook and Instagram first.
What Happens Next
From First Call to Keys Back
Whether it's a fluid change or a 1,000 HP build, the process starts the same way: a real conversation about your vehicle and your goals.
Honest Estimate
You get a straight quote — parts, labor, and timeline. We're not the cheapest shop in Fond du Lac County; we're the one that does it right the first time.
Proven Before Pickup
Performance work gets verified on our in-house dyno before you get the keys. You leave with a graph, not a guess — customer cars have laid down 1,000+ HP here.
Read Our Google Reviews
See what our customers say on Google — real feedback from the people who trust us with their builds, daily drivers, and pride-and-joy classics.
I bought my built Z06 off of someone else last year and didn’t have a lot of info on the cars state of health. I brought it to Adam and he walked me thru, and helped me correct everything the car needed to be in perfect order. The guys here don’t just make stuff up or send you a bill. They care about your car and take pride in their work. Pricing is also the best out of any shop I contacted within hundreds of miles. Any LS or LT owner should bring their car here.
Kyle Peters
3 years ago
5-star Google review
5-Stars!!! They had my 2009 G8 in the shop to tune after I installed headers. Adam was always approachable and answered any questions I had along the way.
They found an issue and took care of it. They also put in an OEM 02 sensor that I needed. They turned off the AFM.
My car sounds GREAT now!! Loving it. Great service and a fair price.
Thanks so much guys!
Reg Campsall
3 years ago
5-star Google review
Work was done very timely matter. Guess because they know what there doing. 66 impala. Installed a Holley super sniper.
Edin Djapo
a year ago
5-star Google review
What to Bring Us
If It Rolls, We'll Talk
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Performance & Builds
Stroker engines, LS swaps, twin-turbo and supercharger installs, EFI conversions, drag & drive prep. Late-model GM is home turf — Mopar and Ford performance are growing fast.
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Dyno Tuning
In-house dyno sessions with real numbers, plus public Dyno Days announced on our social pages.
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Repair & Maintenance
Oil changes, tires, brakes, transmission and differential work, electrical, exhaust — on classics, daily drivers, modern performance vehicles, and exotics.
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Parts, Wheels & Tires
Aftermarket performance parts sold and installed under one roof, plus custom wheel and tire packages — beadlocks included.
Before You Call
Common Questions
GM performance is our core — late-model trucks and classic muscle like Chevelles, GTOs, Impalas, and Corvettes. But we also service classics of every make, modern performance vehicles, exotics, and daily drivers, and we're actively expanding into Mopar and Ford performance.
The cars in our shop belong to people who trust us with their pride and joy — twin-turbo Silverados, drag-and-drive S10s, blown classics. Every vehicle gets race-shop attention to detail, whether it's here for a full build or a fluid change.
Send the form above or call (920) 579-0605. We'll talk through your vehicle and goals, then give you an honest estimate covering parts, labor, and timeline — no pressure, no upsell script.
The dyno is in the building. Tunes and builds get verified on our own rollers before pickup — customer cars have put down 1,000+ HP here, and our drag builds have run 9-second passes and finished Sick Summer.
Ready When You Are
Your Build Starts With a Phone Call
No pressure, no obligation — just a straight conversation about your vehicle, your goals, and an honest number.