I was more referring to holleys mounting system, exhaust and accessory brackets. I am using FItech on my setup for now, I picked up a self tuning ultimate ls setup complete for 1000 bucks that had a low profile intake, injectors and harness. by the time I added up the cost of a factory reworked harness, a used F body intake, rails and injectors plus a tune, I would have had probably double the cost of a self tuning setup. Time will tell if it is worth a crap or not, it seems to have great feed back in N/A setups. If I pull the trigger on a turbo, I may go holley but that is down the road, who knows what will be on the market by then.