How about these cam specs

[oleshifty]

My exhaust is dumped right after factory cats now...I'm going to probably have to throw a muffler on it now


Noticeable as in SOUND or power? I can think of better places to spend the 600 if it won't help power.

PAC 1218 springs? Where can I get those? I've heard a lot of talk about comp 918s.... VHP recommended a set of double HD springs (set was $320)...think I'll pass on THAT.

[Z'06]

Noticeable as in SOUND or power? I can think of better places to spend the 600 if it won't help power.

PAC 1218 springs? Where can I get those? I've heard a lot of talk about comp 918s.... VHP recommended a set of double HD springs (set was $320)...think I'll pass on THAT.

Definitely noticeable as terms of power, but not noticeable in terms of sound with the 116LSA.

Get the PAC 1218 springs here. Comp 918 used to be relabeled PAC 1218 springs (i.e., PAC was Comp's supplier), but then Comp switched production and there were some issues with broken springs from the new production batches. Some say the issues are still occurring. Lots of threads on PT.net discussing this. Anything more (including double springs) would be over-springing and putting unneeded stress on your valvetrain.

I'd get a lower LSA on your lifted truck to help bring the power curve down a bit, especially given that you don't tend to exceed 2500 RPMs stock. If you think a 112 would be too choppy soundwise, the 114 should do the trick for being more aggressive than stock, but not as head-turning as 112.