So in terms of adding L92 heads/intake, which throttle body would bolt and plug right up? My stock 78mm dbw would be too small so looking for something 87-90 range. Could I use the tbss throttle body? Or a newer (08+) truck throttle body? Just want to make sure it will plug right up to my 03 engine harness and be easy to tune. Thanks

 

You will need a dr x harness

 

I hope that 03 gmc has a 6.0 or bigger
L92 heads need a 4.00 inch bore or bigger

 

It has a 6.0 dont worry.

Thanks for the help, no way I would have found that by searching. Found a post here that linked me to torquerush.com. where he sells the harness.
But...they are $225. Are you kidding me? So is there no other option?

 

The only other option is to use a simple adapter harness and an ’02 style TAC Module. It will work, but it’s not all it’s cracked up to be either, as it will not allow 100% throttle blade opening and is the driving factor to everyone using the X-Link by Torquerush.

 

You could also make an adapter for the intake manifold to use your 3 bolt stock 78mm tb

 

Do those adapters exist?
Is the dr. x harness just plug and play or do I have to splice any wires in the engine harness? Does it work flawlessly or are there bugs?

 

And what size throttle body came stock on the L92 intake? Seems like it was a 90mm similar to the tbss one. If so I would also need the same dr X harness for that throttle body as well?

 

X-link is plug & play. 87mm on trucks & 90mm on the cars, not sure about the tbss

 

You could use one of theses...