i am currently running a 6lb. pulley on my powerdyne and had a very good tune done at York Dyno with an SCT chip. ( www.yorkdyno.com ) I have an areomotive adj. FPR with boost compensation. Do you guys think i can get away with adding a 9lb. pulley with out going back for a retune by dropping a little timing out and bumping up the fuel pressure. With the holidays coming up and a wife and 2 daughters to buy presents for i really cant afford to spend $200 dollars for a retune but i want more power. My best 1/4 mile is in my sig. and i wanted to better that before the track closes.