Some trick i learned in my instrallation of a TBSS on my 2002. I found that the cross over tube from a 2004 flex fuel Tahoe fits over the TBSS and allowed me to keep the stock fuel rail and return fuel line. The Flex Fuel Injectors are also taller than the stock injectors that helps in this clearance.View attachment 381983
Pre 2003 Drive By Wire throttle bodies do not need the xlink. I just had to re-pin the connector that came with the 87mm TBSS throttle body. The original TB 8 pin connector uses separate 5 volt and grounds for throttle position sensor where the TBSS TB only has a 6 pin connector that shares the 5 volt and ground.