Rosendale, WI · Speed Shop · In-House Dyno
Custom engine builds, turbo and supercharger installs, EFI conversions, and honest repair — from classic Chevelles and GTOs to modern trucks and exotics. Customer cars have laid down 1,000+ HP on our in-house dyno.
HP — customer cars verified on our in-house dyno
Quarter-mile passes from drag builds prepped at WSP
Performance package stages — daily-driver tune to full race build
Performance Services
Late-model GM is our backbone — and we're expanding into Ford performance. Classic muscle, modern trucks, drag cars, daily drivers: if it needs to make power, it comes here. Start with a custom engine build, dial it in on our in-house dyno, or step up with a proven power adder — explore each path below.
Specializing in late-model LS, Gen V LT, and Ford Coyote 5.0 platforms. From a reliable built LS motor to a supercharged LT4 or a forced-induction ready Coyote, trust Wisco Speed & Performance to power your ride.
Engine Builds →
Unlock your late-model GM or Ford's true potential with precision tuning on our state-of-the-art equipment. Serving Central Wisconsin and the entire Midwest.
Dyno Tuning →
Boost or bottle, single turbo or twins — Wisco Speed & Performance installs, plumbs, wires, and tunes power adders for GM and Ford performance vehicles. Every setup is proven on our in-house dyno before you get the keys.
Power Adders →
Aftermarket wheel and tire packages — beadlocks included — plus brake and suspension setups matched to how you actually drive it.
Packages →
Big horsepower means nothing if the driveline can't take it. Wisco Speed & Performance builds aftermarket transmissions and differentials for hard-launching drag cars and lap-after-lap road course machines — spec'd, installed, and proven in the same building as the engine.
Transmissions & Differentials →
Aftermarket parts sold and installed under one roof — and before you buy someone else's project, let us put eyes on it with a performance pre-purchase inspection.
Performance Car PPI →Maintenance & Repair
You don't need a race car to get race-shop attention to detail. We service classics, modern performance vehicles, daily drivers, and exotics.
Why WSP
Every tune and build gets verified on our own rollers. You leave with a graph, not a guess.
From late-model GM and classic muscle — Chevelles, GTOs, Impalas, Corvettes — to Ford and Mopar performance builds, Wisco Speed & Performance is built around horsepower, not one badge.
Sick Summer finisher builds, 9-second passes, and a track support fleet. Our work gets beat on at the strip — and comes back for more.
Parts sales, install, fabrication, tuning, and maintenance in one shop. No finger-pointing between vendors.
We're not the cheapest shop in Fond du Lac County — we're the one that builds it right and proves it on the dyno before you get the keys.
Reviews
Don't take our word for it — read real reviews from the drivers who trust us with their builds, their daily drivers, and their dyno numbers.
“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.”
“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!”
“Work was done very timely matter. Guess because they know what there doing. 66 impala. Installed a Holley super sniper.”
Community
We host regular public Dyno Days — bring your car, put your number on the board, and hang out with the local car community. Follow us on Facebook and Instagram for the next date.
Get Started
Build quote, tune, tires, or a rattle you can't find — send the details and we'll call you back with a straight answer. No pressure, no upsell script.
177 N Grant St
Rosendale, WI 54974
We'll call you within one business day to talk through your vehicle, your goals, and an honest estimate — parts, labor, and timeline.
1,000+ HP customer pulls on our in-house dyno · Sick Summer finisher builds · 9-second drag passes prepped in this shop. Read our Google reviews →
