+15 Spacer hands down - should have came with one from the factory. Opens up the top end and makes me actually want to hit the high rpms.

 

Spacer AND test pipes. Just get the tp's from the classified section and do the installs yourself. It would still end up cheaper then headers.

 

I wouldn't do anything unless you eventually plan on getting a tune... also if you have a rev-up, they don't benefit from just a plenum spacer, you'd need to get MREV2 + spacer.

For now I'd say test pipes if you had to choose 1. later on do the mrev2+spacer+tune (reflash, osiris, utec etc)

 

Spacer.

 

Non Rev up 04. I believe it was your post in the top 100 questions that states mrev plus spacer has dimishing gains. But I might end up doing both pipes and spacer.

 

why the hell is your SN 06fireZ (and you're right on a non-revup you don't need both mrev2+spacer)

 

LOL I never got around to having someone change it for me. Been meaning to forever now. I doubt you recall, but I was supposed to get a 06 Fire Z, but turns out my bank wouldnt finance an Ebay purchase that was out of the state where i lived. Got right up to the part of putting the deposit down on the Ebay and they took it. Just couldnt get the money to them. So I ended up going with and 04 enthusiast that had all the options and only 14k miles. Paid too much for it though.

Anyway, sooner or later I'll probably just change my nick back to Nuki I guess.

 

I think the spacer will give you the best results, especially since you've got an exhaust already.

 

everybody needs a little "space...r". +1

 

well in that case considering you have non-revup I'd definitely do the spacer...

 

results wise:
1) pulley
2) spacer
3) test pipes
4) headers

installation difficulty:
1) headers
2) pulley
3) test pipe
4) spacer

i vote for pulley or spacer