Skip to main content

Your Cart

Your cart is currently empty.
Click here to continue shopping.

ZZP Stage 2 Kit

Inventory levels of available PCM cores changes constantly, and we are often low/out of certain year cores. If you are rushed please email or before ordering with a refundable core option. 

ZZPerformance makes upgrading your supercharged '05-07 Cobalt SS or '04+ Ion Redline simple with our dyno proven Stage 2 kit.  This Stage 2 is designed with performance and reliability in mind, it comes with the appropriate supporting mods to change your supercharger pulley for more power.  The PCM commands a flat AF ratio and drops timing slightly with decreases in pulley size.   


  • ZZP modular pulley hub with screws and breather barb 
  • ZZP modular aluminum pulley in the size you selected 
  • ECU with our programming on it (if selected) 
  • (4) NGK 4644 Spark Plugs (.035 gap) 
  • (4) 60# Siemens Injectors in a custom case with di-electric grease 
  • Injector adapter harness
  • GM belt  OR  OS tensioner pulley  OR  ZZP adjustable tensioner  
  • Instructions for individual parts 

 How to order your Stage kit: 

Pulley System: Pulley size and color.   
3.1" recommended for users with 91 octane. 
3.0" recommended for users with a ZZP downpipe and 93 octane. 
2.9" we recommend 60# injectors, adding a larger heat exchanger, dual pass endplate, header/downpipe and 91/92 octane. 
2.8" requires the above mods and 93+ octane gas or E85. 
2.7" requires all of the above and cams/valve springs. 

Tensioner/Belt Option:   Determines what you are going to use to take up the slack in the belt when you install the smaller SC pulley.  The  GM Stage 2 belt  is the most popular option, the  Oversized tensioner pulley  requires you to remove the factory tensioner, and grind it to give it some clearance for the oversized replacement pulley, and finally the  Adjustable tensioner  will replace the entire stock tensioner arm and is completely adjustable for any S/C pulley size. 

Injectors:   The kit includes 60# injectors.  The factory 33# injectors are maxed with the factory 3.35" pulley and 42# injectors are already maxed with a 3.1" pulley.  The 60# injectors we include in this kit will support up to around 375whp which is more than most full mod list LSJ cars.   

Core Charge:

If you live in a county that does E-Check emissions testing, you must select "sending core" or "email a file". We cannot change the VIN in this PCM; if you use one of our cores the VIN will not match your car and you cannot pass the test.

 #1  Refundable core charge, for $250 We can ship you a ZZP flashed PCM so you can install everything and simply swap your PCM core and then the core charge is refundable when we receive your original LSJ PCM core back within 30 days. 

#2  I'm sending in my core first, We will hold your order until we receive your LSJ pcm, flash it with our file, and ship it back to you.  However when you select this we will not ship any of the parts until we receive your core, because the PCM flash must match the mods (mainly the injectors and intake). 
If you select "sending in core first" send core to:
  Attn: Order # (order number goes here)
  2450 28th st. SW
  Wyoming, MI 49519

#3  Email me an HPTuner file, If you have HPTuners we can email you our modified file so you can upload it yourself.  However to save you HPTuners credits you would email us the file that you licensed and we would email you back an updated file for your mods. 

#4 I am doing my own tuning, You can buy the kit without a PCM or a PCM file.  

#5 Rent Interface or Rent Interface & Laptop: We can send you a HPTuners interface and cable which we supply with instructions.  It will allow you to read your stock file, email it to us for modification, we email you back a modified tune, you upload it to your ECU, and send us a scan, then if additional tweaks are needed, we can modify the file again to perfect it.  When tuning is done, you can return the interface/laptop, and you are refunded the interface/laptop core charge (deposit).  If you do not rent our laptop, you will need a Windows based laptop to read/write your ECU.  The advantage of using ours is that it comes pre-configured with the tuning and scanning software required so you can simply charge the laptop, power it up and get started immediately.  We can assist you if you have any questions or custom tuning requirements.  If you choose to keep the tuning interface and/or the laptop, that's fine, we just wont refund the core charge.  Core charges are based on 30 days and there will be additional charges if cables or laptops are kept for longer periods.

If you want to purchase a HPTuners suite,  you can add a standard or Pro version to your order here:  HPTuners suite. 
*PCM portion of this kit is non-returnable.

You will need to remove the stock pulley from your supercharger for this kit. We offer a pulley puller for rent or purchase HERE

If using your own laptop for remote tuning, download the latest stable HPTuners VCM Suite here.



Customer Reviews
4.9 Based on 15 Reviews
Write a Review Ask a Question
  • Reviews
  • Questions

Thank you for submitting a review!

Your input is very much appreciated. Share it with your friends so they can enjoy it too!

Filter Reviews:
JayDee B.
United States United States
Solid Choice

Great kit, would recommend.

Dan S.
United States United States
Great kit, big upgrade!

I bought this Saturn Ion Red Line that had some mods done to it but it didn't appear the previous own really followed the full path for a Stage 2 or Stage 3. I emailed ZZP in advance and they were quite helpful in figuring out what had been done and what should have been done that wasn't. I got the Stage 2 kit and the dual pass intercooler end plate. The car runs so much better now! This cured some of the weird stuff the car was doing from the previous "half upgrades" by the previous owner. The car idles better, runs better, pulls harder, it is just a very solid improvement. The only downside is that now I need better tires! I went with the 2.9" pulley and I sent my PCM in to be programmed. Turn around was very quick and they shipped all my parts at the same time, including the PCM. Communication with ZZP was always timely and thorough, instructions were good, quality of the parts was top notch. Can't beat ZZP!

Michael V.
United States United States
Good quality

A+ Great product and will be purchasing more

ZZPerformance ZZP Stage 2 Kit Review
Hector A.
United States United States
Might need dyno tune after install

Everything worked and installed pretty good. Only complaint was the tune on my pcm made the car run extremely rich which cause misfires and spark plug fouling. Took the car to my local dyno shop and fixed the problem.

Brad K.
United States United States
Stage 2 kit for cobalt ss

Everything fit well and worked with no issues. If your stock pulley doesn’t come off at first, tap the center bolt on the pulley remover tool to free it up.