x2, what do you mean by free mods.

 

Coolant bypass, cutting back the EGR pipe (on trucks equipped with EGR), there's a few others I think. Most of the free mods haven't been proven to do much...sometimes they're good for like 1hp

 

Dustin

 

every little bit counts

 

i actually think GMHTP did an ls1 free mod article and picked up like 7hp on the dyno...i'd have to pull the mag out and double check, but im pretty sure.

UDP give you like 10hp...nothing thats a "simple" mod is going to give you much noticable gains unless you do more to it. You could do CAI, TB, UDP, Efans, Tune and you wouldn't really notice a difference. Cam, heads, etc are where the SOTP gauge come into play

i got my asp pulley's right before they went up and i was doin a camswap anyways...if your gonna take it apart you might as well do everything while its easy to access.

 

Here ya go...got you covered...

https://www.performancetrucks.net/fo...d.php?t=397774

 

My SC is just bolted on!

 

I would consider the intake manifold a bolt-on. It doesn't touch oil or coolant.

And in the LT1 Impala world, most of us consider higher ratio roller rockers and valvesprings to be a bolt-ons, but some disagree.

 

i am bolt ons

 

so if i bolt you to my truck, ill gain hp?