Performance Car Tuning
High-end performance car tuning in Weiden
Performance tuning that works on road and track
Unlimited Auto is a certified KFZ-Meisterwerkstatt and tuning shop in Weiden in der Oberpfalz, Bavaria, run by Kfz-Technikermeister Christian Klein. We do Tuning & Performance Builds for vehicles of all brands — optical work through to race-car construction. Christian managed A.T.U. workshops in Munich and Regensburg and has competed in racing series, including at the Nürburgring, so we build cars that hold up under real load. Our flagship is a 1000 PS BMW E36 BiTurbo V12 build with a custom widebody kit. We only fit what we’d drive ourselves. Petrol runs in our blood, and it shows in every build we hand back.
From chip tuning to forced induction
Our Chiptuning & Turbocharging (Chiptuning bis Turboaufladung) runs the full range — from a calibrated ECU remap to fitting forced induction on a naturally aspirated engine. This isn’t a generic remap or a risky power hack. We tune to what your engine and drivetrain can actually take, on manufacturer-grade equipment. As a certified Meisterwerkstatt through the Handwerkskammer Regensburg, we back the numbers with proper diagnostics before and after. Whether you want a sharper daily driver or a serious jump in output, we tell you plainly what’s feasible for your car — and what it costs.
From lowering to full race setup
We cover Tieferlegung bis zum Rennsetup — street lowering right through to full race setup. That means Race Builds & Special Projects (Aufbau von Rennfahrzeugen, Rennsetup), not kit-car assembly or amateur builds. We also build Bodykits & Widebody (Breitbaukit), including one-off widebody kits for all brands, like the custom Breitbaukit on our 1000 PS BMW E36 BiTurbo V12 build. Optical tuning and performance tuning come from the same bench here. Tell us how the car gets used — commute, weekend, track — and we spec the setup around that, not around a catalogue. We make what’s possible — and more.
How much does chip tuning improve performance?
It depends entirely on your engine — which is why we diagnose first and promise nothing blind. A turbocharged engine typically has more headroom than a naturally aspirated one, so gains vary by platform. As a certified master workshop, we map to safe, sustainable limits, not headline figures. You get honest numbers for your specific car, plus advice on supporting work — cooling, fuelling, clutch — so the extra power lasts. No runaround, no over-promising.
Performance ECU remap for road and track
Our Chiptuning & Turbocharging (Chiptuning bis Turboaufladung) starts with a proper ECU remap tuned to how you drive. Road-focused maps prioritise drivability and reliability; track-focused maps push harder where the hardware allows. We run diagnostics before and after so you can see what changed. Certified through the Handwerkskammer Regensburg, we treat your ECU with the same care as a dealership service — dealership quality without the overhead. We only fit what we’d drive ourselves.
Chip tuning for vehicles of all brands
We tune Fahrzeuge aller Marken — the workshop is brand-agnostic for both service and performance. Repairs for All Brands (Reparaturen für Fahrzeuge aller Marken) is core to how Unlimited Auto works, and the same applies to Chiptuning & Turbocharging. Whether your car is German, Japanese or something rarer, we assess it on its own merits. Christian Klein’s years across A.T.U. workshops in Munich and Regensburg mean broad hands-on experience across platforms. Bring us the car, and we’ll tell you what your specific engine can safely deliver.
Turbocharging a naturally aspirated engine
Yes, we fit forced induction to naturally aspirated engines — it’s part of our Chiptuning & Turbocharging (Chiptuning bis Turboaufladung) work, not a bolt-on afterthought. Adding a turbo changes far more than power: fuelling, cooling, internals and clutch all need to match. That’s exactly the kind of build a certified Meisterwerkstatt should handle, and it’s what we do. We spec each conversion around your goals and your car, then build it to hold together under real conditions. We make what’s possible — and more.
How forced induction feasibility and cost work
Feasibility comes before price — always. Some engines take forced induction well; others need substantial supporting work first. We assess your platform honestly and tell you what’s realistic. Pricing depends on the build scope, so we scope it properly rather than quote a number off a shelf. You’ll get a clear picture of what the conversion involves before any spanner moves. That’s dealership quality without the overhead — straight answers, no fluff.
Engine builds from street power to race-grade
Our engine work runs from stronger street power to race-grade output, all under Race Builds & Special Projects (Aufbau von Rennfahrzeugen, Rennsetup). The proof is on the bench: a 1000 PS BMW E36 BiTurbo V12 build, showcasing what we can do with a custom engine conversion. This is our flagship showcase project, not a stock spec. Christian Klein has competed in racing series including at the Nürburgring, so we build engines to survive being driven hard. We don’t do amateur builds. We show what’s possible rather than just promising it.
Suspension lowering vs. coilover setup
Lowering and a full coilover setup solve different problems — we help you pick the right one. Simple lowering drops the car for looks and a firmer stance. An adjustable setup lets you tune ride height and handling for how you actually drive. Our work covers Tieferlegung bis zum Rennsetup, so we can go from a clean street drop to a properly dialled track setup. As a certified master workshop, we set it up right and check the chassis afterwards. We only fit what we’d drive ourselves.
Lowering for looks and for handling performance
A good lowering setup should do both — look right and actually improve how the car handles. Drop it wrong and you kill the ride and the geometry; that’s not tuning, it’s guessing. We set ride height, then check and correct steering and chassis alignment, because we already do Fahrwerksprüfung and suspension repair as everyday service. So your lowered car handles better, not just sits lower. Dealership quality without the overhead, from a certified Meisterwerkstatt in Weiden in der Oberpfalz.
From street lowering to full race setup
We take suspension all the way — Tieferlegung bis zum Rennsetup, street lowering through to full race setup. A street drop and a race setup ask different things of the car, so we build to your use case, not a one-size approach. Race-grade setup is part of our Race Builds & Special Projects (Aufbau von Rennfahrzeugen, Rennsetup), backed by Christian Klein’s own racing experience, including at the Nürburgring. Tell us where the car runs, and we spec the suspension to match.
Can a road car be built into a race car?
Yes — turning a road car into a race build is core to what we do under Race Builds & Special Projects (Aufbau von Rennfahrzeugen, Rennsetup). Our 1000 PS BMW E36 BiTurbo V12 build shows the extreme end of it. Most builds sit below that, scoped to your goals and budget. We assess the base car first, then plan engine, suspension and bodywork as one coherent build. Certified master workshop, real racing experience — not amateur builds.
Best workshop for a track car build in Bavaria
For a track car build in Bavaria, Unlimited Auto brings something most shops can’t: a certified KFZ-Meisterwerkstatt and tuning shop under one roof in Weiden in der Oberpfalz. Christian Klein holds the Kfz-Technikermeister title via the Handwerkskammer Regensburg and has competed at the Nürburgring. We handle Tuning & Performance Builds and Race Builds & Special Projects in-house, from engine to suspension to widebody. That’s dealership-quality workmanship with genuine enthusiast credibility — petrol in our blood. We show what’s possible rather than just promising it.
How to prepare a car for the Nürburgring
Prepping for the Nürburgring is about survival under sustained load, not just peak power. That means sorted cooling, brakes, suspension and a setup that holds up lap after lap — exactly the Rennsetup end of our work. Christian Klein has raced there himself, so we prepare cars from experience, not theory. We assess your car, tell you honestly what it needs, and build it as a certified master workshop. No shortcuts on the parts that keep you safe.