i bought a b20/vtec from a guy on this site, few people are saying that i cant run a stock 4-2-1 header with my muffler because of the back pressure, they say to get the dc 4-1 header so there isn't any back pressure. So i figure i'd ask the best place here.


Motor
98 b20b
84.5 wiesco pistons
eagle rods
gsr portflow head
type r valves, portflow retainers and springs
skunk 2 stage 2 cams
AEM blue cam gears
skunk 2 manifold
Siemens 440c injectors
AEM silver fuel rail and regulator
CTR crank pulley
gsr tranny, action clutch
Hondata 2B

Thank you, Andrew

 

If it were me, and I had spent the money on that motor, I'd run a custom 2.0L VTEC header such as SMSP. A stock 4-2-1 manifold will be a definite restriction, and even a DC JDM 4-1 wouldn't be ideal.

 

a stock header would just waste your motor.

get a custom one from almost any major custom header company

 

unless you got that motor for like 50 bux it would be a god damn shame and a sin against the honda gods to run a OEM header on that engine.

look into ANR, headertech, smsp, dtr or the bare minumim jdm dc 4-1 or jdm oem honda 4-1

 

yes i know i will be getting a better header i'm only 18 yrs old so im alittle bit broke now. so i will be fine running a stock header for the time being?

 

Look into buying a JDM ITR 4-1 header, thats what I have, affordable too. Won't have to worry about quality because you know its a honda product.

I got mine from http://www.jhpusa.com $400 shipped.

 

Are you wondering if is going to damage the motor? Is that why you are asking?

 

yes whats what i mean.

 

It shouldn't hurt anything, but the restrictiveness will probably cause things like decreased gas mileage. To what extent, I'm not sure.