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Bolt On Downpipe?


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#1
150DollarRacer

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So im trying to figure out cheap ways to make more power with the civic. IM thinking about making a custom exhaust for it using the stock exhaust manifold. The hardest part will be making the 4 bolt flange that would attach to the manifold where the cat used to be.

Does anyone make that flange or possibly a downpipe? If not, Ill probably have to get the flange made and then have some piping welded up.

I guess the other option is to find a tubular header to bolt up. Can those be found cheaply or from another honda? The engine is a D15A2.

#2
150DollarRacer

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So I found these headers on summits website:

HED-37010
Honda: 1984-87 1.5L CRX/Civic Si, 1 1/2 in. primary tubes, 2 in. collector, Chikara
$119.95

HED-37014
Honda: 1984-87 1.5L CRX/Civic Si, 1 3/8 in. to 1 5/8 in. primary tubes, 2 in. collector, with Y-pipe and equal...
$189.95

Has anyone purchased Hedman Hedders before? Whats your experience? According to Hedmans website the headers are designed for the CRX which means to get them to work on my civic I will need a CRX oil pan? Or is that only the case for the stock CRX manifold? Or am I completely wrong and neither header will bolt up to my engine?

#3
rpr

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The header will work, but not sure about the oil pan. I THINK it will work, because I had a Chikara/Hedman in my Civic, and although it had a CRX motor, I don't think it had an SI pan.
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#4
150DollarRacer

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ok, so assuming that the oil pan isnt an issue, will the header bolt up to the stock exhaust piping? im trying to figure out how I will get a local shop to weld up an exhaust even though i wont have a cat. They are pretty rigid with their rules.