Medic/Z28

iTrader: (9)

Having done my heads and cam install with tune. Changed everything basically from the block up. I was wondering if getting my TB P&P and a pulley would be worth the expense? How much will these two bolt ons give me at the wheels? Is it 12-15RWHP with both combined after install? Will I need a re-tune? You alls advise is greatly appreciate. OH! Which pulley is best recommended and which one gives the less headaches as far belt slipping issues are concern?
Thank-You