Help Me Please!!!


Blindman

Blindman

Vinyl Junkie
Joined
Jul 19, 2007
Messages
29
Yo. I've got a 99 Civic DX Hatch that i've completely overhauled. I've just installed an authentic B16B engine. It's great! I'll post pictures in the future. Right now i've got a really irritating problem, and was wondering if anyone else has run into this. i just got my Magnaflow exhaust for a Civic HB. The test pipe is set to mount to the downpipe on the DX engine. 1 3/4" ID. The stock downpipe on the B16B has a 2 1/4" pipe, and the crush gasket is 3 1/8" around at it's largest point. I knew this was going to be a problem, so i was planning to custom fabricate a test pipe with a larger flange, but I can't even find a flange for it. Magnaflow has no idea what i'm talking about, they don't even acknowledge that the Type R exists. Does anyone have any ideas, or know where i can get a J Spec test pipe that will fit the Magnaflow 2 1/4" exhaust?
 
2.25 exhuast? big mistake, b16b needs at least a 2.5" unless your running NO cat, anyways, you can get flanges from a few places, what size flange and bolt patter do you exactly need?
 
It's whatever flange fits over that 3 1/8" doughnut gasket. It's the two hole flange/ cat mount flange. As far as needing 2.5", the ID of the downpipe is 2.25"(57.2mm) according to (http://www.isitaboat.co.uk/cars/honda_civic_type_r__ek9_/#generalstats)
and the most of the exhaust systems i found available for a Civic Hatch were all 2.25" ID pipe. I'm using a Magnaflow 2.25 universal cat, and building the rest of the 16" section of pipe around that. I think I may have found a flange that will work on Summit Racing, but i won't know for sure until it arrives. hopefully this works.....
 
Blindman said:
As far as needing 2.5", the ID of the downpipe is 2.25"(57.2mm) according to (http://www.isitaboat.co.uk/cars/honda_civic_type_r__ek9_/#generalstats)
and the most of the exhaust systems i found available for a Civic Hatch were all 2.25" ID pipe.
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the reason most exhuasts for your hatch are 2.25" is becuase there made for your STOCK pos sohc engine. oh and lets not forget i have a b16b myself and have experienced both, anyhow its up to you.

any reason your not taking this to an exhuast shop? they could probably fix it in under an hour for and for less than $100

also are you going to be keeping the stock header? im only asking cause its going to be a pain if you get a new header it once again it dosent fit, and then you have to make another test pipe.
 
Exhaust size depends on engine size/power and where you want you're power curve. A 2.5" exhaust on a b16b is going to work best at high rpm's. A 60mm or 2.36" exhaust is better all around for a generally stock, street driven b16b in my opinion. I know rvm loves his twin loop at 60mm, much better exhaust velocity than the old comptech 3".
 
Dino-Spumoni said:
Exhaust size depends on engine size/power and where you want you're power curve. A 2.5" exhaust on a b16b is going to work best at high rpm's. A 60mm or 2.36" exhaust is better all around for a generally stock, street driven b16b in my opinion. I know rvm loves his twin loop at 60mm, much better exhaust velocity than the old comptech 3".
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i agree but the op has even small exhuast than 60mm he has 2.25"
 
Dino-Spumoni said:
Exhaust size depends on engine size/power and where you want you're power curve. A 2.5" exhaust on a b16b is going to work best at high rpm's. A 60mm or 2.36" exhaust is better all around for a generally stock, street driven b16b in my opinion. I know rvm loves his twin loop at 60mm, much better exhaust velocity than the old comptech 3".
Click to expand...

Thanks for the advice, that's the kind of info i'm looking for. I'm kind of locked into the 2.25" exhaust at the moment, due to funds, but i may look into a custom 2.5" pipe as funds become available. I've got a few friends that work at exhaust shops, and i'm a pretty accomplished welder, so it shouldn't be a problem. Thanks again
 
Blindman said:
Thanks for the advice, that's the kind of info i'm looking for. I'm kind of locked into the 2.25" exhaust at the moment, due to funds, but i may look into a custom 2.5" pipe as funds become available. I've got a few friends that work at exhaust shops, and i'm a pretty accomplished welder, so it shouldn't be a problem. Thanks again
Click to expand...

Many exhaust shops use mild steel that is crush bent.
Crush bending can reduce flow by up to 50% vs. mandrel bending, and mild steel rusts and is thick and heavy.
An exhaust is not a load bearing tube, so you want a thin-walled piping to save weight.
You also want stainless for looks and longevity. (aluminum in some cases, but thats custom and expensive)
I have asked about custom made exhausts of SS and mandrel bends, and they said its much more cost effective to buy an exhaust that is pre-made for the civic, that way theres mandrel bends already and the fitment is good.
After you buy a pre-made exhaust you can add whatever muffler, resonator's, and de-cats if you want.
 
excellent point dino :nice: SS prices are very high right now, i dont think it would cost more to have one custom made, but it would be about the same, i say ~$500+ for a mandrel bent SS full exhuast with resonators and muffler section.
 
blinx9900 said:
well, anyways, you can get flanges from here and its quality stuff:

http://vibrantperformance.com/catal..._1067&osCsid=04a6f4565c597a28f27c1c0b4faf53f1
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Thanks again for finding that part for me. I've contacted the company and they've confirmed that it is exactly what I need. Trouble is, they don't deal with the public, for the US they go through Motovisity, who distributes to dealers. I've talked to Vibrant, Motovisity, and 28 dealers across the US that show that part on their websites, and they're all out of stock. Finally, I talked to Vibrant again and found out that they will ship new stock this week, which means Motovisity gets it next week, and the dealers get it 2-3 weeks later. So close yet so far..... No problem though, I just discovered that my friend's uncle builds Nascars, so he said he'd machine a part for me. Soon i'll have this car back on the road...
 
Don't know if anyone is still reading this this thread, but i figured i'd follow up. I finally found the flange i needed by talking to Omnipower, and they helped me out by hooking me up with the company that makes their test pipes, and i was able to order just the J-spec flange. It arrived today, and after some welding, i've got a pretty professional looking high-flow cat installed. All i can say is the car runs great now, that mild back pressure has really helped out the performance. I swear i've gained 10hp off this.:) Anyway, the company Omnipower referred me to is www.kteller.com. They've got some good stuff
 
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