i have a sts turbo on my chevy silverado 2005 5.3 v8 i have upgraded injectors headers thats about it right now lol but i was wondering how much boost my motor can handle i have a 10 spring on there right now im at 5-7psi but i want to boost up too 10-15psi... my truck is still slow to me at 5-7psi but i also have 22's on it i dont know if that maybe wieghing me down but just let me know what yall think

 

You may just need to change ur ring and pinion to make up the difference of the bigger wheels.

 

Ask that question on www.ls1truck.com They have all kinds of info on that web site.