i haven an 03 sierra 1500 w/ 80k miles, 3.73 eaton posi, magnaflow exhaust, homemade air intake, what modifications can i do to get a lot more power? while keeping it a daily driver and not having to rob a bank, i really want to do an engine swap to the 6.0L lq4 or lq9, but i dont know which is better and what else will i need to do?

 

you have a 5.3? What about tuning?

 

I believe the LQ9 has the stronger components, and best bang for the buck is Nitrous.

Dustin

 

tune, headers,shiftkit,servo's,cam,stall, is a good start

 

its the 4.8, and ive looked into doing a cam and all that and to really get a lot of power out of the 4.8 im lookin at spending a good bit when i can just drop in a lq9 and have something to work with, so what will it take to swap from a 4.8L auto tranny into a lq9? will my stock tranny be ok? and whats gonna have to be done?

 

Never done it before, but a few searches revealed a computer re-flash to recognize the extra cubic inches is all that's required. It would be wise to change the camshaft and match the springs for the cam, along with a matching exhaust system to seal the deal on a sweet ride.

 

well the problem is i dont know which motor to go with, ive heard something about the lq9 being drive by wire? i have no idea what that means and what it will take?

 

drive by wire is an electronic throttle body, vs. cables turning the throttle blade. even if one is and the other isnt you can swap the throttlebodys and be ok.

 

which is better the dbw or by cable, and if i swap the throttle body off of my 4.8L will it work on the lq9?

 

yes it will be fine, I do not know if one throttle body is better than the other, and all the throttle body's are same size except for the SSR 90mm