Thread: What size exhaust are you guys using with NA VE's?

That's what everyone says but I find it so hard to believe. Are there any easy to find dyno charts that prove this?

If your SR20VE is stock and ONLY has a 3" exhaust you will lose power down low. However, once you start getting more modifications like an intake, big header, N1 cams, etc. the 3"exhaust has a semi-synergistic effect with the others and that low-end loss disappears and you make more power.

Its not loud at all cruising around and driving etc but once that VVL activates this thing sounds disgustingly amazing lol brings a smile to my face everyday. I will be removing that muffler soon and installing my 3" Apexi WS because thats whats on my G35 and I just love how they look so the vibrant may be up for sale very soon.

this is false. too large in diameter exhaust tubing will have less exhaust velocity causing bad scavenging and less torque. that velocity creates a vacuum behind closed valves helping the exhaust flow out of the cylinder.



so in your opinion with my setup a 3in exhaust would benefit me more than a 2.5?

It may save you money in the end if you are planning on getting more modifications down the road, so you don't have to go swap again from a 2.5 to a 3"

My go-fast mods are:

-N1 cams with supertech valve springs
-JMR header
-Cold air intake
-G-Spec crank and water pump under drive pulleys
-Marsh ECU
-Port & polished head
-Fidanza flywheel (well not really a "go fast" but u know what I mean)

And of course, the 3" exhaust. That setup made 206WHP before the head polishing. No doubt, the 3" makes more power over the 2.5" when combined with other modifications. So if you plan on getting those kind of things I'd go for the 3". Again, just removing the catalytic converter on my car increased the peak WHP from 198WHP to 206WHP. That shows you how much the car needed to "breathe" or "exhaust" ----> in this case that word is used as a verb.

It has been dyno proven countless times that a 3" makes more than a 2.5" through out the ENTIRE rev range..

3" hands down.

My VE felt sooooooooo much more torquey down low moving from a 2.25" up to a 3"
Cannot tell if it's faster up top, but the torque just felt amazing. Opposite of what I expected.

3" Exhaust here, made 10whp more than the 2.5" exhaust, with the stock VE engine.

The largest your ears can handle it.