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With the addition of most programmers, you will see increased rail pressure. Unfortunately, the factory relief valve in the rail will prematurely relieve much of this pressure, not allowing it to reach the injectors, thus robbing you of horsepower. This simple shim kit allows for higher rail pressure before it is relieved.
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Josh Verified Buyer 3/12/17
I would use this product again
Kyle Verified Buyer 10/25/17
Pretty easy to install, just got efi live and need just a bit more pressure and this did the trick.
Thanks so much for the review. For those that don't want to fully block their pressure relief valve, this shim kit will deliver that little bit of extra pressure while still maintaining the factory safeguard.
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