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Originally Posted by Tom1222
Okay, I don't understand that statement. You do want a header but you don't want an exhaust? Do you realize that a header is part of the exhaust system. Further more did you know your Si already had a header?!
It is a shorty header but nevertheless a header and not just an exhaust manifold. If you do get a header (I would recommend the Vibrant header and Cat combo that is going to be out real soon) I wouldn't recommend using the stock cat back since you will be defeating the purpose of the header in freeing up back pressure. The stock cat back is pretty restrictive. If you don't want it too loud I would suggest a Greddy SP2 or a APEXIs WS II system. Those are about the quietest cat backs out there which will still gain you some ponies. I would still invest in an intake whatever it may be.
If you look at your stock intake it is the most involved tangeled mess you have ever seen. Big old ugly box on top going to tubing leading down to the front bumper where it goes into another box called the resonator and then exits into a small opening. You are choking your car if you are putting on a "raceheader" and not letting it breathe. Sure you can do it but why?
If you want to keep the car stock just leave it alone and don't worry about a header and the hondadata relflash. Just put in a ZEX Nitrous kit and use it with your stock set up. You can be stealthy and stock when you want to and get a noticable kick when you want it  That mod will give you the best of both worlds and a noticable gain in feelable performance. Plus it is cheaper than a hondadata reflash 
But it's your car and you can do what you want to with it. I just don't understand your logic if there is any.  |
Ok man, here is my logic and thank you for the words of wisdom...I don't really have experience with this (mods beside intakes, all I did is have an intake on my old civic..) so I am clueless about headers, exaust, etc...hondata...I just learn on 8th gen about hondata and k-pro (but still don't know what the hell k-pro is either
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Yes, I do know my civic has a header
, I just don't know anything about it...but you have pointed out the header is part of the exaust,
My logic is that I want the car to remain close to stock , especially in exterior appearance, but I want more hp and torque mid-range. But, my question is isn't the stock header and stock exaust pretty good, I mean how much better flow will we get with aftermarket ? I thought the si was designed for performance. And, I thought the stock intake system is awesome
built into the fender wall, that is much better than any sri soaking up all the heat in the bay - and I live in a warm climate! But, if I do get I/H/E and reflash, I appreciate the quiet exaust you told me about. I also wouldn't have a clue about which header - you mentioned vibrant, 4-2 or 4-1? And, a regular header or race header ? I don't want my si too loud. I think it sounds awesome stock the way it is tuned. And, where I live there is no inspection, so I can get rid of my cat coverter, or get a high flow cat...which I am clueless about too bro
, so thanks for the tips ..........