I am doing an LT1 swap this week, and I am basically dead set on ordering a cable and purchasing tunercat software to reprogram my PCM. I am curious to know what the actual differences are between the L99 and LT1 tune? I know people make money by tuning pcms and all, but I would love to be able to say that I accomplished it myself. I'm sure there is confidential information about tuning these that I have to pay money to receive.. but I figure it's worth a shot to ask. I'd be willing to trade a fancy L99 Intake in exchange for some direct tips on tuning my pcm haha. :wink: Any input would be appreciated regardless, thank you.