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K20A EH2 said:
I recently read that the K20 does not respond well to larger diameter piping.

Any truth to this?
When you clog a suction hose on a vacumm, it must let air out to suck air in. If you add a free flowing exhaust you must also add an intake.

For piping diameter look at DC Sports because they already figured that out.
 

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K20A EH2 said:
I recently read that the K20 does not respond well to larger diameter piping.

Any truth to this?
on a stock motor this would apply

I was running 3 inch piping and i picked up 7 whp...no loss in the mid
 

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That's pretty amazing.... Any loss in torque????

It's hard to believe all motor running 3" thats KRAZY...


I remember people doing that with B series and it literally killed their car.

I have to go with the 2.5 b/c of my muffler.... That sux.
 

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supafly said:
That's pretty amazing.... Any loss in torque????

It's hard to believe all motor running 3" thats KRAZY...


I remember people doing that with B series and it literally killed their car.


I have to go with the 2.5 b/c of my muffler.... That sux.
Needing back pressure are lies but too big of a pipe affects velocity.
 

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I just think running 3" pipe to the DC5 R muffler even with the valving system wont allow it to flow enough air.
 

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supafly said:
I just think running 3" pipe to the DC5 R muffler even with the valving system wont allow it to flow enough air.
Shoot for 2.5 inch then ...I believe this is the oe size piping diameter
 

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Well we just dropped from a header with a 3" pipe and to a 2 1/2" pipe off the header on our drag car, Its only got a small bullet muffler in it still. I'd say from seat of the pants tuning its better with the 2 1/2 but I will be having it re-dyno'd with both soon to get an exact reading...
 

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non vtec said:
I definately say go with the 2 1/2" it might be different on a road car, but running an almost open header set-up the 2 1/2" set-up worked better, no dyno figures yet though..
Let me know ..im a ways off from dynoeing the diff between the 2
 

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K20EG said:
I was running 3 inch piping and i picked up 7 whp...no loss in the mid
i ran a 3" with my b'series and it made a positive gain. it could be that your running itb's.. i was too.
 

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y not go with a 2.75..something in between...i thought the stock diameter for the dc5 r is 2.5 or close to that
 
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