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I have an 03 with a greddy evo 2 exhaust AEM intake and BBS wheels so I was wondering what would be the next logical upgrade to get some power from my is? Something DIY and not super duper expensive.
 

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I would say headers.
 

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toss a mazzuri super header and y pipe on there.
 
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If your worried about smoging just put a megan y-pipe on no O2 sim required and WILL pass smog. If you don't care about smoging (like me) go with a megan headers and y-pipe combo or mazzuri combo. Both of them WILL need an O2 sim. If you get the megan you can also piece it together. Get the y-pipe now and then the headers later. The mazzuri you have to buy the whole combo together. Just think about it.
 

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Go with some Mazzuri headers if youre looking for power. You should look into doin some suspension work though to make your IS handle better. Thats just my opinion.
 

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Headers. Exhaust Cam Gear after all engine mods.

I agree with JPLexIS, try some suspension mods. The benefits are great and relative to what you can do to your car, they are fairly inexpensive.
 

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for power; everyone is right - get a header


but 'next logical mod' imo is:

brakes/stopping: steel lines, motul 600 fluid and decent pads
- or -
suspension/handling: sways are cheapest and easiest DIY for suspension
 

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Not to thread jack but.........

When you add the y pipe, and no header (for emissions) does the car get loud like with a header or does the stock exhaust manifold keep things quiet??
 

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Header and Y-pipe, SAFCII, cam gear....get it tuned and your set. Although, header wise, I'd stick with something simple like Megan, Alphawerks, OBX, and etc., and ect....The Mazzuri is a great setup but, I think that it is too loud imo. Sounds really nice at WOT but, if you want a conservative sound with gains, stick with regular headers....but, if you are strictly just all performance, go with the Mazzuri. G/L on your journey bro.
 

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Not to thread jack but.........

When you add the y pipe, and no header (for emissions) does the car get loud like with a header or does the stock exhaust manifold keep things quiet??
the Y-Pipe does add extra noise but, a good one. gives your car a much better exhaust note...adding headers will def increase noise levels.
 
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