06 2.5i Mods - Suggestions, advice?

[DRDR]

Hey guys,

So I'm new to the scene and don't know too much. I've been trying to do a lot of research but still have a few questions. My Subaru Liberty 2.5i Premium 06 is my first car that is any good and I'm looking at performing a few of the basic mods to it.

I know there's not much you can do to the N/A engine. I've purchased an AVO filter and a pair of the Grimspeed Phenolic spacers and gaskets. I've tried to do as much research on them as I can, and from what I've gathered they're the one thing that will give the greatest improvement. Does anyone have much experience with these? Also, I know you have to take the intake manifold off to install them. I'm having my car in for a 100k service soon and was hoping they could chuck them on then.

I'm also interested in putting on a rear sway bar with upgraded mounts but probably skip upgrading the endlinks. I'm in the process of ordering the Whiteline RSB and Avo mounts. Is it worth me grabbing the FSB while I'm at it?

I've posted a similar thread on the American LegacyGT boards but thought it'd be good to get some Aussie inpute.
So any comments, input, suggestions would be appreciated. This site has been invaluable already for information. Cheers guys!