Rep Power: 289

Ok so I'm still trying to wrap my brain around this concept, because I don't know what's underneath the EX.
Quick back story,
I bought some games off some guy in my area through craigslist, and it turns out his brother had a 7th gen EX which he was selling his aftermarket header for. I was like "How much do you want?" He says 35 bucks. So I I'm like what the hell, lets see it. So he comes back with a used manifold and this down pipe looking thing, which looks pretty decent shape, especially for 35 bucks, it looked great. When he came back, he said that his brother told him that it was a Megan Racing header. I looked on the header and it has a little metal tag welded on, that says HP racing So i have no idea what it really is or if hp racing is just part of megain, but I bought it anyways.

This is what it looks like: (Pictures soon when t-mobile starts working again)

I got home and searched on the internet, no luck finding anything with the search term civic and hp racing, but I did find an image searching civic and megain racing which looks exactly like what I have:



Here are the problems, I think....

Pictured above, I never got those gaskets and bolts from the seller, can I use what's already in my engine bay? The stock bolts and gaskets? Or do I have to buy new ones from megan racing?

I have an LX and I'm seeing that these units are only sold for EX's, Does that mean I have to get an aftermarket or EX catalytic converter and weld it in line with the rest of the exhaust or something?

If I have to get a cat welded in, then I might as well just get a universal muffler and get a pipe bent to fit and welded in cat.

Can anyone please help? Im I missing anything?
Thanks!

 
Rep Power: 248

those look like clean stock gaskets...if there is nothing wrong with yours use them, if yours are shot go buy some from Napa. They are friggin' cheap.

 
Rep Power: 289

Ok, sweet. I didn't think it would be expensive.

 
Rep Power: 289

All of my questions were already answered in the other thread in the members rides section. Thanks.

 
Rep Power: 304

a stock gasket wont work, but i believe an s2000 gasket will work for the manifold/header to the midpipe/ct pipe. you can use any ex or lx cat back exhaust

 
Rep Power: 289

Hm, everyone in other thread said that the gaskets would be just fine...

 
Rep Power: 304

the donut gasket on the stock header is about .25" too small. i had this problem putting the stock exhaust back on my car. i though i could use the gasket off the header but it was too large in dia. and this was on a dc header which has smaller primary's than the hp or megan so i would assume it the collector flange should be at leaset that same size as the dc

 
Rep Power: 261

^^ i tried explaining this but everone says it fits so w.e...... i know 4rm experience it wont. at least mine didnt for my obx header...which im pretty sure has a same size collector as dc and megan.

 
Rep Power: 289

I might just have to try to assemble it off the car and see what happens. If it doesn't want to fit, then at least I don't have to put my car back together. I was beginning to think it wasn't going to fit simply because it's a larger pipe. Thanks for the input

 
Rep Power: 261

yea..i found out too late.. after i put it on my car

i ran back to napa like twice to find a different size and none of them fit.. i suck at measuring..so then i just gave up and i have this nasty sounding leak so.. yea..assemble it on the floor first.

 
Rep Power: 304

i have dont the install on numerous occasions. the results were all the same. one was an obx as well and also the dc. have not used the hp but i cant imagine it would keep the collector the same size as stock. hp i think has the largest primarys out of the bunch. it definately wouldnt bottleneck down to stock collector size.
you WILL need a new gasket!

 
Rep Power: 261

well since uve already installed the obx..can u tell me what size donut gasket i need..sorry to jack the thread but..yea i wana know. i been meaning to get under my car but am kinda too busy. itd be cool if i could just get the exact size right off the bat and go run to the store and get it.. thanks in advance

 
Rep Power: 304

in all honesty no i cant remember. i THINK it may be like 1-5/8". i do know the a stock donut gasket from a s2000 will fit. i have a stock one at home ill measure tonight

 
Rep Power: 261

thank u very much. i appreciate it.. if i can get the size right i might as well order it tonight since i have to order a new air filter anyway. thanks again