We did some testing on a 2007 Silverado 5.3L engine. It’s a new body style truck that comes OEM with the 90mm throttle body and what looks exactly like a TBSS intake manifold which we were swapping to a FAST LSXRT truck intake manifold.

The truck tested was 100%stock, and there was no tuning done during testing, the OEM 90mm DBW throttle body was used on the 102mm intake.

The intakes were fairly close below 4500RPM, but after 4500 RPM is where the FAST LSXRT started to take off!!

Here are the power gains.

4500 +3.5rwhp
5000 +17.3rwhp
5500 +20.5rwhp
6000 +19.8rwhp

 

wow, thats an awsome gain for a stock engine for what you would think is already a vary good intake and not even going with a bigger tb! that sounds like a damm good intake!

 

Thumbs up from this reader....wonder what we could see out of a tune? Wats one of those drain the 'ol bank account for?

 

Wow! Thanks for sharing the data. The only variable between the runs was the intake correct? Everything else was the exact same?

 

Correct.

 

Wow...and ..WOW!!! I could only imagine what a tune would do!!! Its hard for me to see in the pics, what was done with the pcv hoses? thanks for posting your results from the intake.

 

They were not installed for testing.

 

That's awesome, especially considering that the intake that you removed is what most guys with the GMT800 considers an upgrade! Is this intake a direct bolt on, or do the accessories need to be modified?

 

cool, I think 20hp for a $1000 is steep, but nice gain anyways. i want to see tuned results too. what did the TQ do?

 

I didnt mention that the FAST intake provides provisions for all the PCV. They will simply connect using the factory connections/hardware.