Exhaust piping diameter best suited for K20?

[#2]

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[midoriek4]

so go smaller or bigger?

[Colorofmoney]

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.

[K20EG]

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

[supafly]

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.

[Colorofmoney]

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.

[supafly]

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

[K20EG]

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

[non vtec]

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...

[non vtec]

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..

[K20EG]

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

[evilxkid]

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.

[Project SSAP1]

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

[supafly]

yeah I think stock was like 2 3/8