If i put the srt intake and an exhaust, with new headers on the car what type of power gains will an manifold get me? or should i go for a different upgrade? also whats the cost for a manifold

 

Intake doesnt do much if any power difference... all it does is make the car louder and the air flow into the engine cleaner.... exhause on the other hand might increase about 15 to 20 hp

 

Also dont waste money on an expensive intake, any would work... try ebay and dont look for brands... you can get a good one for 40 bucks

 

SRT Intake, header, and exhaust will get you at about 200rwhp, give or take.

 

Wow, that is horrible advice. If this poster had done any research (which they obviously haven't) you will see that the GS is very sensitive to different intake systems and will frequently throw a check engine light if a improperly designed (as in cheap eBay intake) is used.

The best options are an SRT intake (should give you around 15hp by itself), a K&N drop in, probably about 5hp but easy to install or you could go with an Injen intake and Apexi SAFC combo which will need to be tuned on the dyno but should net you about 15hp as well.

 

is all I have to say.

 

He wanted to say exhaust, not exhause. 15-20 hp is a little on the high side for that mod.

macd7919 and mex lex have this dailed in properly as far as any potential gain. Until you go boosted, don't expect anything big.

 

I know what he meant. I'm just saying good luck getting 15-20 hp out of an exhaust.

 

I am for sure going with SRT intake. as for exhaust i am either going to go cheap and go borla axle backs or go tanabe catback and headers, but i would only do tanabe if it gave me a noticible amount of power. Thoughts?

 

Actually the el cheap-o ebay intake will work just as well as any other intake, on the one exception that you have to have an SAFC or something similar to compensate for the different piping diameter. I think the injen intake has a small reducer section where the MAF sits to counter the need for the SAFC. However, there are a few intakes like the AEM one for the GS that don't have the reducer and will require the SAFC to run properly. IMO the SRT intake is just an overpriced pipe that they can justify the price on because they have a "pre-tuned" AFC included. Get the cheap ebay intake + used SAFC for about $250-300 total. Then get it tuned for around $100-150 and you will make as much, if not more power than the SRT. The upside is if you ever decide to get headers, exhaust, etc in the future...the SAFC is reprogrammable while the SRT ecu settings are not changeable.

 

Newb question, who makes the SAFC also which cheapo intake do you recommend. Last how much does it cost to get tuned. And do you autocross that beast of a GS of yours

 

Apexi makes a few safc's for our car. The apexi neo and the apexi safc2 are the newest ones. Eather one would be fine for your application. Its like 100-200 for a tune I believe.