i have a 4.8 with a 212/218 comp cam an a nelson tune an it runs pretty good

 

i went 13.2 with the mods in my sig, i probably could have gone a little faster but i got tired of dicking withe small motor, I am swapping in a LQ9 shortly

 

see thats about were i wanna be is around 12 or 13s

 

than do this to yours

4.8, 90mm TBSS intake, PRC stage 2.5 heads, FTI 214/220 .600/.597 108+2, 3600ish, EFILive, Efans, Airaid CAI, UD Pulley, AEM Lts, Magnaflow, DMH e-cutout, 4.10s, TrueTrac, Transgo HD2, Servos

 

alright il look into it thanx for the help the only thing i dont wanna change is the gears cause i dont wanna loose alot of topend

 

i would do what fred said and save any money you would spend on mods and buy a 6.0. I've done the 4.8, 6.0 thing and there is no comparison.

 

i was thinkin about that but i like this little motor lol

 

once u start more expensive mods like cam, heads, converter, etc. you will wish you had bought a 6.0. been there and done that the 4.8 is just an underpowered motor. im lookin to swap my with a lq9 or lq4. theres no replacement for displacement!!!

 

yeah but it wont hurt me if it aint super fast i just need a lil extra get up

 

My new toy has the 4.8. I have a 6.0 on the engine stand for it, but gonna leave the 4.8 in for a while.
Id recommend do all your supporting mods first
Tune, full exhaust, torque converter, cai and possibly go to at least a 3.42, preferably 3.73-3.90 gears and a locking diff.
If you're still not happy, get a cam. If that isn't enough, quit throwing money at it and do the 6.0 then. Even with the 6.0 you're gonna want the exhaust, gears, cai etc, so it really isn't money wasted. If you're happy with the performance then (doubt you will be) then good. If not, at least everything will swap over to the 6.0