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Ok, here's the deal. I installed the hp header and high flow cat. with this new combo there are three holes/bungs for the oxygen sensors. Two are on the new header itself and one is on the new cat. Two of these holes are used one is not. I do not know what to put in the third hole. The owner of hp header said to use preexisting hardware but there were no bolts/screws large enough to use. So my question is to everyone that has installed this...what did you use to plug up that extra bung hole. Thank you very much.
Shlomo

 
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Nobody has any ideas??

 
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Can't you go to a hardware store and buy the right size "bung" to plug the hole? I have the same set up but don't remember encountering this problem.

 
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just get a bolt that fits properly in the hole and screw it in. its really that simple.

 
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i've looked at pepboys, sears hardware, menards, and home depot and i have found no bolts that fit. I called hp and they said that the bolt size is 17mm, does anyone know of a store that carries bolts this large? Thanks

 
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hypr drv. how many "bungs" were in your header and cat that you bought?? I only have two O2 sensors but three bungs.

 
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Yeah, same with me. But the shop that installed my header and downpipe got it to work somehow. I also got an O2 Simulator with mine. But that just wires right into the ECU. There has to be a bolt that will fit.

 
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so after countless phone calls to numerous hardware stores and car parts stores i finally ended up at NAPA who said the had what i needed. When i arrived at NAPA they said they didn't have the bolt i needed. So they lied to me on the phone. I spent 1 and a half hours in NAPA waiting for the sales guy to find the right bolt. $1.29 later the bolt doesn't even fit. So hopefully after tommorow morning it will be resolved...HYPR DRV did your hp header/cat come w/ the O2 simulator and do you have a check engine light??

 
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I got the O2 Sim seperately so the CEL wouldn't come on after I installed the downpipe that replaces the cat.

 
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ok, well i finally got it to work after going to NAPA again this morning. I've been flat out lied to two times in the past 24 hours. Bad customer service. Anyways im using a 3/8 inch oil drain plug. it was a little loose going in but once in, it should be perfectly fine. Just incase anyone else has this problem. Thanks for everyones help.

 
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hey HYPR DRV, does your car ratttle/shake more than it used to? Also when you use your A/C does your car shake even more? Thanks, i just wanted to see if it was normal.

 
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^^^Uhhhh, I guess my car vibrates from the exhaust when I'm idling with the A/C on. But I wouldn't say that the car itself shakes or rattles. I didn't notice anything like that when I had my header/cat replaced. Just vibrations from the exhaust.

 
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Ok, well mine vibrates more w/ the new header/cat. Thanks for the response though.

 
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did you shave your motor mount? if you have an manual EX you gotta shave off part of the motor mount.

 
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yeah, i actually removed the motor mount, installed the header and shaved some of the black metal part that was in the way of the header. I'm thinking that i might need to shave some more off. I also think i have a leak between the header and the cat. (I'm hearing two different exhaust tones) Is there supposed to be a gasket in between the two new pieces?

 
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Two different tones at the same time?

 
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yeah, like i hear one tone coming from the engine bay and another tone from the actual exhaust outlet. I'm going to check for a leak where the header and cat meet.

 
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I'm having a similar issue with my new EX header and high flow cat. I just changed mine out from the stock HX setup and discovered a gasket on the end of the stock header. Going to install it tomorrow and see if that fixes it. Not quite sure it will as I think the HX and EX may use a different gasket.

Since you have an EX check your stock header and cat(if you still have them) to see if you have the gasket. Putting that on should fix your leak.

 
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yeah, i looked at the old header and cat and there was nothing. Do you think i could buy one from Honda?

 
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I'm sure you could order one from the parts department at your dealership. Shouldn't be too expensive a part. It'll probably be $10 or less.

 
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so there is a gasket inbetween the stock header and stock cat?

 
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According to this parts site I was looking at there is. auto parts select
Haven't had a chance to put the gasket in because I slept all day.

 
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wow. Thanks for your help, i have to go buy one now and try to get rid of that leak.

 
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Hey. Did you ever get that gasket in? I put mine on a couple weeks ago and it made the leak stop right away.

 
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i just got it in the mail today, so i'm gonna put it on this weekend. the gasket is like a round metal piece about the diameter of an orange right?

 
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That sounds about right. Just slip it in and tighten the bolts back up and it should work fine. Remember to alternate as you are putting the bolts back on so you don't put too much pressure on one side.

 
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does your header rattle against the motor mount/frame of the car, mine does and i allready shaved some off. if so can u tell me the spots u shaved?

 
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I haven't noticed any rattling. I've heard of your problem before but can't remember what they had to shave.

 
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i shaved a little off the black metal piece of the motor mount...but i also think that the header is hitting the cross frame in the front of the engine bay, and i don't think that that is such a good idea??

 
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Not sure on that one. I haven't had that problem with my GR Motorsports header.