LS1 With AC Kit


We are proud to announce that we have designed two new turbo systems for the 1998 – 2002 F-body LS1 cars. This kit in particular is designed to be used with the stock k-member and will require the removal of the A/C. There is no way to keep the A/C using this system as we know customers will ask. However, check our other page if you wanted to keep A/C as we have designed a 2nd kit that will retain A/C but will require you to use our turbo k-member.

Our non-a/c LS1 turbo system is one of the most complete kits on the market today for these cars. You will not have to track down manifolds from trucks, turbo from another place and make exhaust. We have a complete system to offer with many options so that you can get about all you need to install from one shop if you want. Our kit comes with everything you need on the hotside from manifolds to your turbo. The y-pipe we built off each manifold is 2.5” and merges in the middle and keeps the radiator in the stock location. Each kit will include our On 3 Performance 70mm turbocharger. This is the same turbocharger that’s been on our shop 2002 Mustang GT for the last 4 years and has been daily driven since then. We have put over 20,000 miles on that car and the turbo has proven the test of time and put through a ton of abuse. We use this turbo in almost all of our kits and will have no problem supporting up to around 650rwhp. We do also have the On 3 Performance 76mm turbocharger available for this kit as well and you can find in the optional items down the page(available in ceramic ball bearing and CNC billet wheel options). Also coming fall of 2012, our newest turbocharger, a t4 flanged 88mm which will be a huge hit with the LSx market. Pricing on that TBA.

Coming out of the turbo, we supply you a 3 piece downpipe that routes to the stock catback. That way you are able to keep the exhaust note manageable and not drawl too much attention if you don’t want. Although it can be ran open downpipe as well very easily while most of our customers over time prefer to run a full exhaust setup. Some say turbo cars are quite but under partial or full throttle and open downpipe, its somewhat obnoxious personally.

Moving on to the cold side of the kit, we have built a 2.5” charge pipe that feeds the intercooler and coming out of the intercooler to the throttle body transitions into 3”. Each kit comes with our crossflow 3” On 3 Performance bar and plate intercooler. We also have a 4” core that is available as well and listed under our optional items if you plan on maxing out your shortblock or if you have a built motor going for higher boost levels. Our 5 ply On 3 Performance silicone couplers connect each intercooler pipe together and t-bolt clamps ensure maximum clamping force and prevent any intercooler pipes from blowing. Each pipe is bead rolled on both ends to add extra protection from losing a pipe under boost. All intercooler piping is made from 6061 aluminum to help dissipate heat and also keep weight down over using stainless. Lastly, our kit is designed without a maf provision, most all builds we see go speed density for tuning so if you plan on running a maf, you will need to adapt that on your own.

Each Kit Includes


  • On 3 Performance Custom V-Banded Passenger side Manifold
  • On 3 Performance Cast Driver side Manifold
  • 2.5” 304ss Crossover Pipe, T4 Turbo Flanged
  • On 3 Performance 3” Stainless Downpipe (Pre-welded for wideband)
  • V-band Clamps For Turbo And 1st Downpipe Section
  • Lap-band Clamps For Back 2 Downpipe Connections
  • V-banded 304ss Dump Tube


  • Complete Aluminum Intercooler Hard Pipe Kit
  • On 3 Performance 5 ply Custom Silicone Coupler Kit
  • All T-bolt Clamps For Couplers
  • On 3 Performance Bar & Plate Crossflow Front Mount Intercooler

Kit Contents

  • On 3 Performance 70mm Turbocharger, .70ar Cold, .81 or .96ar Exhaust Housing
  • On 3 Performance 44mm V-band Wastegate
  • On 3 Performance 50mm Blow Off Valve
  • On 3 Performance Alternator Relocation Kit
  • On 3 Performance Custom Oil Feed Lines / Drain Kit
  • Hardware Kit
  • Instruction CD w/ Photos

Optional Items

  • On 3 Performance 67mm Ceramic Ball Bearing Turbo $389
  • On 3 Performance 76mm Journal Bearing Turbo $125
  • On 3 Performance 76mm Ceramic Ball Bearing Turbo $419
  • On 3 Performance CNC Billet Compressor Wheel $199
  • On 3 Performance 42# Fuel Injectors $329
  • On 3 Performance 60# Fuel Injectors $350
  • On 3 Performance 4” Race Core Intercooler $99
  • On 3 Performance 340lph Fuel Pump $90
  • On 3 Performance Turbo Blanket $70
  • On 3 Performance cBB Turbo Oil Restrictor $25
  • On 3 Performance Custom Urethane Stainless Air Filter $45
  • On 3 an -10 Black Anodized Oil Drain Kit Upgrade $54

Re-cap On Key Features Of The System:

  • Serious Horsepower Potentials
  • Works Great On Manual Or Automatic Transmissions
  • Keeps All Factory Accessories
  • Designed / Tested Thoroughly, Proven System
  • Neatly Packaged
  • Welded For Easy Wideband o2 Installation
  • V-band Connection For Downpipe Off The Turbo
  • Large Bar & Plate Intercooler
Tentative Pricing at $1999
*** Due to constantly upgrading and improving products, photos may not always represent the exact product shipped. We are always tweaking and changing the systems for the better. Exact colors, tubing tweaks/routing, wastegates, etc can vary. So if you have any question prior to purchasing, please contact us first.
Copyright On 3 Performance - 2012