Honda Civic Performance - JDM Discussion Engine tech, forced induction, springs, shocks, brakes, tires, etc.

2.5" to 2"

Old 28-May-2007, 04:45 PM
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2.5" to 2"

just wondering. If I put a stock axle back 2" with fully 2.5 header to midpipe...will that harm the engine since the exhaust pressure goes back to the motor everytime i let go of gas? correct If Im wrong
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Old 28-May-2007, 07:01 PM
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ideally you would want 2.5" all the way through
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Old 28-May-2007, 10:10 PM
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Originally posted by egb18c
ideally you would want 2.5" all the way through
yes. but I will have to replace my current axle to a stock one for a short time period, the one i have now is too damn loud. so...will 2.5--> 2.0 will harm the motor?
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Old 28-May-2007, 10:22 PM
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no it wont harm your engine... it will choke off a bit of power but I highly doubt it will harm your engine.
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Old 28-May-2007, 10:28 PM
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No harm in that. If anything, I find smaller diameter pipe will yield a bit better low end torque. Of course, you suffer top end power but you gotta do what you gotta do.
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Old 29-May-2007, 01:49 PM
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hahahaha.... hahahahaha...

oh wow, you guys have never seen my exhaust then...

i am running a stock cx d-series exhaust on my gsr right now. you worried about back pressure with a 2 inch? lol.

i make no power after 6k. lol.
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Old 29-May-2007, 03:28 PM
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Originally posted by mikepasini
hahahaha.... hahahahaha...

oh wow, you guys have never seen my exhaust then...

i am running a stock cx d-series exhaust on my gsr right now. you worried about back pressure with a 2 inch? lol.
I make no power after 6k. lol.
Thats funny, on my B16a with stage 2 cams, upgraded valvetrain, cam gears, tuned ecu, shave head, ported, 3 angle valve job, tuned ecu blah blah blah I have the stock SI exhaust because I dont want the loud annoying sound!
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Old 29-May-2007, 11:16 PM
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honestly man, run a 2.5" and you will feel the difference. its not like upgrading an exhaust you might feel a little.. but imaging how much it gets choked at like 8k... with a 2.5" you feel a nice increase in pull right to the top.
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Old 30-May-2007, 10:04 AM
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yeah I know.... I think I am going to go with the DC header I have cause it was only $50 and then the setup from there is all 2.5 vibrant with there new super quiet resonator, and the flat black muffler to end it... what do you guys think?
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Old 31-May-2007, 01:03 AM
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i love the vibrant stealth blacks... they are real nice.

i would probably run it without a cat, but I just like shooting flames out the back. thats all.

just keep it min 2.5" and go mandrel bent for the piping, because with i believe its called crush bent or something like that, the flow wont be as direct since it narrows at the bends.
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Old 03-Jun-2007, 09:04 PM
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why would a stock exhaust damage an engine lol.
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Old 04-Jun-2007, 10:52 AM
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Originally posted by Kingjames1983
yeah I know.... I think I am going to go with the DC header I have cause it was only $50 and then the setup from there is all 2.5 vibrant with there new super quiet resonator, and the flat black muffler to end it... what do you guys think?
unless the dc header is a true 2.5" collector, ii would sell it to someone else with a stock b16. you want a 2.5" collector and 2.5" after that and you will have the best flow... i believe the d headers taper down to 2.25" and i wouldn't want that.


like a jdm 4-1 type -r header or even the megan racing ones would do for a reasonable price.
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