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PSI Conversion Performance Parts 

LS Swap Harnesses and More

Why PSI

A PSI Harness is made with top quality material right here in the USA. Our customer service is second to none and can be reached by phone five days a week and emailed 24 hours a day. We have a combined 25+ years experience. Don't wait 4 to 5 weeks for your harness to ship. PSI LS Swap harnesses are always in stock and usually ship in 1-3 business days!

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LTX Gen V Guide

Trying to figure out what LT engine you have? Check the PSI VIN Decoder to decipher your engine information by VIN#.

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LSX Guide

Trying to figure out what LS engine you have? Check the PSI VIN Decoder to decipher your engine information by VIN#.

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