Welcome to Peformance Systems Integration!
We specialize in developing and packaging components and kits for retrofitting older vehicles with Electronic Fuel Injection (EFI), most notably the GM LT1 & LS1/LS6/LS2/Vortec Engines and 4L60E Transmission. We offer a full range of products including Standalone wiring harnesses, replacement GM connector pigtails, PCM programming and other fuel injection related parts for GM LT1, LS1/LS6/Vortec (Gen III), LS2 (Gen IV), Tuned Port Injection (TPI) and Throttle Body Injection (TBI) Engines. Free technical advice and documentation is also provided, just ask.

What is an LT1, LS1/LS6/Vortec Conversion?
This is the retrofitting or 'swapping' of a GM Gen II (LT1) or Gen III (LS1/LS6/Vortec) engine into an older vehicle such as a muscle car or street rod for increased performance, better fuel economy and overall increased driveability. Since these cars did not come with EFI originally
there are many parts required to complete the conversion. PSI
provides the products you need to get the job done right!
Find out more about LT1's in our Technical Section.

Products and information are always being added so come back often.
If you have peformed an LT1/LS1 or EFI Conversion send us some pics
and we will post it on our site.

Check out some new in-house projects we have been working on, click here!!!

!!News - LS1/LS2 O2 EXTENSION HARNESSES

!!News - LS1/LS6 STANDALONE WIRING HARNESSES WITH AND WITHOUT 4L60E TRANSMISSIONS
NOW AVAILABLE!!!