Search is not helping me for some reason so i will ask. I have stock bottom end LS1 with 233/239 TSP cam and Stage 2.5 PRC 5.3 Heads. I have a LS6 intake but am considering a FAST. Not sure whether to go 102 or find a 92. What parts will i need to run both? so far this is what i believe

FAST 102
Intake itself
102mm TB
New MAF
New Lid
New Tube
Fuel Rails

Fast 92
Intake itself
92mm TB
Fuel Rails
Already have 85mm MAF and Lid

Am i missing anything? Trying to weigh out the costs vs performance. Leaning towards the 92

 

Stock rails work with a 90/92 but not the 102.

You can get a bellows (pipe?) to work on either lid/TB/maf combo though the bigger 102 will benefit from the larger everything more....

In my case I didn't see the cost effectiveness on my setup and stuck with the 90 I already had but to some trying to wring out every last pony it is worth it... 104mm lid/100mm maf/92TB/ported 90 IM here..

 

Look in the general FAST thread or Intake/Valley Cover Part Numbers thread. You would maybe need to change fuel injectors with the 102 depending on what you have and might want to consider an LS2 water pump if you don't want to go through the heartache of grinding down the LS1 water pump for the 102 to clear. You would also need the fuel line conversion kit if you decided on the FAST billet fuel rails.