The Dyno Is in the Building
Every tune and build gets verified on our own rollers before you get the keys. You leave with a graph, not a guess — and we host public Dyno Days so anyone can put a number on the board.
Our Story
Built in Rosendale. Beat On at the Strip.
Wisco Speed & Performance (WSP) specializes in GM performance, repair, aftermarket parts sales, and custom wheel and tire packages. GM is the core of the shop — late-model trucks and muscle, plus the classics we grew up on: Chevelles, GTOs, Impalas, Corvettes — but the doors are open to classic cars, modern performance vehicles, and exotics alike.
The work runs the full range: from fluid changes, transmission and differential work, fuel systems, and electronics all the way up to full stroker engine builds and turbo and supercharger installs. A 418 stroker breathing through twin Borg Warner 69s and an LSA converted from nitrous to twin turbos have both rolled out of this shop.
What sets WSP apart is what happens after the wrenches go down: every serious build gets strapped to our in-house dyno. Customer cars have laid down 1,000+ horsepower on our rollers, our drag-and-drive builds have finished Sick Summer, and shop-prepped cars have run 9-second quarter-mile passes. We don't hand you promises — we hand you a graph.
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.
