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I've seen so many post saying d15 and d16 headers will fit a d17 but im not 100% sure thats true, so i figured I'd just ask on here. I Got a 2003 honda civic ex coupe with a jdm d17a engine i swapped into it and a magnaflow street series cat-back exhaust, I wanna get a 4-2-1 header and a better catalytic converter but not sure whats the best route (as in what will fit best) for that set up. Can anyone tell me of a good-great 4-2-1 header with Catalytic converter set up?
thanks for the advice in advance.

 
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Flow is good, don't worry about the brand, a pipe is a pipe, any cheap ebay header will flow the same as the high end brands.

I'd suggest a highflow cat. from Magnaflow.

I'm guessing you're not boosted or running a high comp racing setup with ITBs. So really any exhaust system that flows 2.25" will work well and sound good.

 
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thanks for the advice. Im still kinda new to tunning. No my cars not boosted or running a high comp racing set up with ITBs, all i have put on is a magnaflow street series cat-back exhaust with the main tubbing diameter at 2.25" and a weapon r dragon short ram intake. I don't really care for brands so i could still stay cheap. Are their interchangeable headers from other engines for the d17a?

 
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what engine is in there? VTEC active?

when they are in special sales, I got the DC sports, and gave some kick to my EX D17A2 (although I already had the Crower stage 1 cam and AEM CAI)

but it is a 4-1 - although the crower cam increase torque all over the band, so not sure the impact on a stock camshafted car.

 
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thanks for the reply and info. My honda civic has a jdm D17A vtec 1.7l 4cyl engine. Would doing the stage 1 cam and AEM CAI be better then doing a 4-2-1 header with a performance catalytic converter?

 
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just drop the cam and it will be the highest gain these engines will ever have.

later on you decide what you want to change next.

do one at a time and you will know what you will get from them.

intake/exhaust alone will only get you more noise when stock camshaft. lots of members in the past have done and knows it. Anyone saying that he had gains have a pretty weak butt-dyno

having the camshaft and then adding later the intake/exhaust, and it will uncork even further the camshaft.

 
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thanks. Looks like ill do the cam, is there a good cam set up or are they all kinda the same

 
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crower stage 1 cam. that the cam that does the magic

just drop it in and do the ECU relearn

 
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thanks, the only crower stage 1 cam I can find is for the d17a2. Will that work on my d17a? Sorry for all the questions

 
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best ask to vendor, i honestly have no idea.

although i think it was slightly higher compression or such. they wouldn't mess too much around, it is costly to change the tooling to make something different just to make it different

 
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okie thanks youve been a lot of help