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I am just starting to mod out my car which is a 2003 civic ex automatic coupe and so far I got an AEM intake and on order I have an HP race header and a magnaflow exhaust on the way. I read somewhere that you can replace the throttle body with a good aftermarket one for more power. Is this a good idea? What else can I do to my car to get some more power w/o breaking the bank. Any ideas would be appreciated. Thanks

 
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The most cost effective thing you can do for more power is just to leave the car alone. I'm not kidding, by the time you're done you'll be left with a 5 hp gain, a torque loss throughout most of the band, a headache whenever you drive more than a few miles away, and a lighter wallet.

Oh, and to answer your question, I'm not aware of any aftermarket TB's available for the D17.

 
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I haven't seen a company with a d17 throttle body.
You'll have to get a stcok one bored out.

KMS is one comant that does it:
[url]http://www.honda-performance.com/services-throttlebody.asp?bhcp=1[\url]