how much hp will be added to my 98 npi gt with flowmasters and k&n filter. if i do mac lts, the h- pipe with high flow cats(dont wanna screw around with emissions),pi swap (not full motor) pi heads withCompetition porting, competition valve job, Ferrea SS forged valves, 7000 rpm spring package and the hot street cams. Also a tune from a handheld tuner (which kind do you recommend?). Over the stock 225 how much would i have including the flowmasters and filter i already have(even tho i kno they dont add much)???

 

Well the flowmasters and K&N dont do ****
Long tubes = 15-20 Rwhp or it might just be regular im not sure
I dont know what PI heads will give you but if you do get all the PI stuff..your lookin at around 260 hp at the wheels