I purchased my car bone stock back in Feb, 05.

I haven't tune my Si, the question is.... Should I tune it, what are the gains I'll see?
Here is a list of my mods...

AEM SRI
AEM adjustable cams
AEM underdrive pulley Kit
AEM fuel filter
DC Sports Header
Magnaflow exhaust system

***About to install SKUNK2 Pro Series intake manifold, just got it yesterday***

Any input, is always appreciated

 

You can go ahead and tune to squeeze extra hp out, however, you won't know if you are doing any good or not unless on a dyno IMO.

Same with dialing in the cam gears. You can change up the timing etc, but you wont really know if you gaining power unless on a dyno.

Damn, no love for the Mishimoto radiator I don't see you mentioned it in the OP.

 

tuning is usually pretty expensive if you're having someone who knows what they're doing do it for you. So, as far as the gains you'll see its probably not worth it unless you turbo or supercharge your engine. THEN tuning is a necessity. I say save your money.

 

I didn't mentioned the Radiator because I don't concider it a performance upgrade lol, I replaced my OEM radiator because it went out. So I decided not to go OEM.

I guess i'll just keep the money and not tune it? That means more money in my pocket = more Lakers games LOL