Tuned performance introduction
Thread Starter
Supporting Vendor
Joined: Nov 2025
Posts: 254
Likes: 28
From: Cotopaxi, Colorado
Tuned performance introduction
Hello all c4 owners, i want to take the time to introduce myself and services i offer .
my name is Brian, i have been tuning stock and modified thirdgen f bodies and corvettes tuned port injection tpi systems since 99. I started out on eBay and other forums formerly user id Tunedport90 for the last 14 years.. check out my newer website www.tunedperformance.org for tpi parts and your tuning needs from vats deletes to 383-400sbc builds I can help with it all.
my name is Brian, i have been tuning stock and modified thirdgen f bodies and corvettes tuned port injection tpi systems since 99. I started out on eBay and other forums formerly user id Tunedport90 for the last 14 years.. check out my newer website www.tunedperformance.org for tpi parts and your tuning needs from vats deletes to 383-400sbc builds I can help with it all.
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Last edited by Tunedperformancedotorg; Jan 24, 2026 at 05:10 PM.
Thread Starter
Supporting Vendor
Joined: Nov 2025
Posts: 254
Likes: 28
From: Cotopaxi, Colorado
Vats delete sale going on as well as egr block plates.
https://tunedperformance.org/store/p/gm-vats-delete
https://tunedperformance.org/store/p/gm-vats-delete
Last edited by Tunedperformancedotorg; Apr 1, 2026 at 09:35 PM.
Melting Slicks
Joined: May 2019
Posts: 3,181
Likes: 1,376
From: Mid-Atlantic
2025 C4 of the Year Finalist - Unmodified
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Does the vats delete programming disable the alarm system too. Seems like it might/would.
Thread Starter
Supporting Vendor
Joined: Nov 2025
Posts: 254
Likes: 28
From: Cotopaxi, Colorado
The delete is done in the ecms programming. The change made the ecm will not try detect a hz signal to enable the injectors. There will be no handshake . To fully bypass the vats the starter enable relay get jumped to bypass it as well. Hope that answers your question
Thread Starter
Supporting Vendor
Joined: Nov 2025
Posts: 254
Likes: 28
From: Cotopaxi, Colorado
Vats delete sale going on as well as egr block plates.
https://tunedperformance.org/store/p/gm-vats-delete
https://tunedperformance.org/store/p/gm-vats-delete
any questions or diagnostic help feel free to email or pm.
Heel & Toe
Joined: Jun 2018
Posts: 21
Likes: 19
From: Southern Indiana
Quick Testimony- @Tunedperformancedotorg worked with me on my 1988 Pontiac Trans Am GTA before and after a new rebuild. He knows tuning and is very responsive..
Thread Starter
Supporting Vendor
Joined: Nov 2025
Posts: 254
Likes: 28
From: Cotopaxi, Colorado
Thank you very much for your support, I’ve tuned a lot of c4s tpi and a few lt1 92-93 vats mostly deletes on those years.
https://www.thirdgen.org/forums/dfi-...rformance.html
https://www.thirdgen.org/forums/dfi-...rformance.html
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