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CTS owners rejoice, our Vortech based supercharger system is now available for the 2nd generation model Cadillac CTS with Direct Injection V6 engines.

The Overkill Vortech supercharger solves the problem of wanting more power out of your CTS V6 to match that of today's showroom turbo V6 CTS, and now you can bolt that on to the CTS currently in your driveway; Stage 1 kits bump horsepower to around 450 horsepower, while upgrades are available to make beyond 500 horsepower.

Simple installation with no cutting, sawing or fabrication, and fully reversible; a professional can install in 6-8 hours, with a weekend being more than sufficient for a DIY installer. No existing or additional modifications are required for installing this system, it comes with everything required on an otherwise factory vehicle.

Here's several main features included in the Overkill supercharger kit, and their benefits:



Listen to the unique whir of this style supercharger at idle, it gets some attention!


Watch Corey's Stage 2 Cadillac CTS4 wagon go 0-60mph in 4.4 seconds!



All CTS kits are very similar but we do have specific items for each different engine and whether your vehicle is rear wheel drive or all wheel drive for example, so please ensure to select your vehicle from the drop down menus accurately and you'll be asked for your vehicle's VIN to double verify you get the right components, you'll want to be sent the right components!

Stage 1 Kit Information

The Stage 1 kit comes set up with 8-9psi of boost to make a realistic 125 horsepower gain. It can be installed on a completely factory 3.6 V6 by a competent professional mechanic in roughly 6-8 hours and is a good driveway weekend DIY job for a good amateur mechanic using basic tools (an impact driver is recommended). You do not need any modifications on your vehicle to install Stage 1, comes with everything you need. You'll need to run 91 octane gasoline or higher. While tuning is custom through Overkill Motorsport, you'll be required to do some back and forth emailing of driving scans of your vehicle, or you may seek out a local tuning shop at your descretion which can receive support from Overkill. Aftermarket exhaust work is beneficial but not required. On my own personal 2010 CTS, I ran a base kit with all the parts you'll receive, and absolutely no other modifications.

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Select Your Kit
What year is your CTS
What Engine Do You Have
Rear Wheel Drive or All Wheel
Enter Your VIN





Stage 2 LFX Kit Information - 500 Horsepower Kit

Our Stage 2 kit added onto our Stage 1 provides with more boost and the required fuel system modification to support it. A high flow fuel tank fuel pump replaces the factory V6 fuel pump and larger fuel injectors replace the factory injectors for additional fuel capacity. A change of supercharger pulley then bumps the boost up to 11-12psi (from the 8-9psi of Stage 1). This provides the power to make 400-420 wheel horsepower, a 175-200 engine horsepower gain over factory. For those willing to do the more indepth installations, the power gains from Stage 2 are worth it!

*NEW* Stage 2.5 is for the 2012-2014 3.6 and 2010-14 3.0 exclusively to run E85 ethanol fuel. The 2.5 kit includes a replacement high pressure fuel pump (mounted at the back of the driver's cylinder head) that allows more fuel pressure and fuel system capacity. You'll also get the Overkill flex fuel conversion kit to allow the computer to read the fuel's ethanol content and adjust automatically.

Once again, the Stage 2 is specific to your vehicle, as different model years take different fuel pumps, and different engines take different injectors, so ensure to select your vehicle correctly so you receive the right parts the first time!

Select Your Year/Engine
Enter Your VIN to verify














Question: What Power Gains Are Expected?

Answer: On the V6 DI engines, power is improved on Stage 1 kits 100-125 horsepower at the engine. For example, with our chassis dyno, factory 3.6s dyno 250-260 wheel horsepower, with their appropriate 20% powertrain losses, while our base kits dyno 350-370 wheel horsepower, a 100-120 horsepower gain. See above for a dyno graph, an example of a base kit dynoed before and after on the same dyno on a 2008 CTS 3.6 LLT, a 108 wheel horsepower gain, LFX will be similar.

Question: Do I Need To Do Anything To The Car First Before Installing?

Answer: Everything that's needed to install the supercharger is included in the supercharger kit. You're not required to have any other modifications done first. If you have higher mileage, consider doing a full set of ignition coils to ensure no misfires with the new power; you can search for "D515C" on ebay, amazon or rock auto and should be able to get a full set of AC Delco coils for $200-225. Lastly is you should be all up to date on your servicing, including changing your transmission oil and differential oil following "severe" service intervals, which typically call for replacement every 50k miles. For your engine oil, it is very highly recommended that you use synthetic oil if you're not already.

Question: How Reliable Is This Setup?

Answer: The 3.6 engine has proven itself durable on a supercharged setup. We've been supercharging the 3.6 for over 2 years and know the limits of boost, fuel capacity, ideal air/fuel mixture, spark timing etc, to build durable and lasting setups. The supercharger system is also proven reliable; we've engineered durable custom components and matched them with top quality off-the-shelf components when required. Aside from oil changes on the Vortech, our goal is to have you install this system and enjoy it without the need for constant attention to any component.

Question: Can The Car Handle This?

Answer: Again, the 3.6 engine has proven itself durable on a supercharged setup. The transmission has also proven itself reliable and won't break due to power handling capacity with the Stage 2 kit power. Similarly, the all wheel drive system has shown its ability to handle 550 horsepower without issue. We get the occasional inquirey about whether the engine mounts will handle this and questions of that type, and the answer is yes that's not an issue.

Question: How Does The Kit Install?

Answer: The kit is a truly bolt on installation. The Vortech head unit bolts to our mounting plate system, the mounting plate system bolts to existing fastening points on the engine, the crank pulley slip fits and bolts infront of the factory pulley, the intercooler system bolts behind the front bumper cover to the crash bar by drilling and tapping new bolt holes (a drill bit and tap are included), and our piping runs through the engine bay and bumper area from the Vortech to the intercooler and back to the engine. Nothing needs to be permanently modified, we include new replacement items rather than asking for old ones to be modified, we've taken care to provide an easy and enjoyable installation. A professional mechanic can install this kit in 6-8 hours typically, and a competent amateur mechanic can install within a weekend.

Click this link to view the installation instructions

Question: Why not buy a V instead?

Answer: To be clear, we're not targetting the power offered by a "V2" (2nd generation 2009-13 CTS-V with supercharged V8), they're an awesome machine, however you do have to pay for them. Whenever we calculate, we come up with $15,000-20,000 to trade an equivalent V6 model for a V2. This supercharger kit solves the problem of wanting more power on your own vehicle, not having to go and find someone elses to buy instead. There's a significant price difference too.



Want to see what the installation is like? Click here for PDF installation instructions




Independent Belt System


One of the things we wanted to ensure as part of our design was an independent supercharger belt system. Rather than using the factory OEM accessory belt, our system uses its own supercharger belt and leaves the factory belt completely intact.

We do this by first installing our new crankshaft pulley. Removing the crankshaft bolt allows you to slide the new pulley as an insert into the factory pulley, and then secure with the bolt. The new pulley indexes into the spokes of the OEM pulley so it is locked into place and cannot slip.



Rather than using the 6-rib factory belt, a wider 8-rib belt will reduce belt slip issues as we start to get smaller and smaller on the pulleys. We can do this because we are not limited using the OEM accessory belt, this can only be accomplished with a dedicated supercharger belt.

Front Mount Intercooler And Components


Our intercooler system is made of top quality components. Silicone tubing is 5-ply and fibre reinforced, aluminum tubing is powdercoated and bead rolled on the ends, clamps are made in the USA stainless steel T-Bolt, a 50mm Tial blow off valve that has the capacity to vent supercharger boost, and the intercooler is an all aluminum Mishimoto unit.


Supercharger Specific Catch Can System


Our Catch Can System included with each supercharger system is set up specifically to perform with forced induction. Unlike a generic catch-can which connects between the intake manifold and engine on the "dirty side" of the PCV system only, ours connects to both sides of the PCV and provides two suction sources for the dirty side crankcase. When the intake manifold becomes pressurized, the catch can looses suction from the manifold, and the crankcase can become pressurized with boost pressure; our catch can uses a check valve to close and prevent boost from pressurizing the catch can, and a secondary suction line connected right before the supercharger inlet actually uses the vacuum created by the supercharger to continue to draw air from the crankcase. As an extra backup, a clean side separator attached to the oil filler cap separates and prevents oil vapors flowing down the clean side line into the intake path. The entire system means that oil will stay out of the supercharger inlet, out of the intake manifold, out of the intercooler, and reduces blowby at the piston rings, all of which improves engine safety, supercharger lifespan, and overall performance.