stock exhaust vs open down pipe at 600plus awhp

[NickS VR4]

I'm curious if you have/are able to test the GCTech Manifolds with this turbos vs stock. I don't think there are any numbers yet for them.

[fredwei]

$25 per horse power.

Not bad at all.

[ChargerX3]

So is this both tests with a stillen dp with stock catback, or is this a completely stock exhaust vs the stillen dp? The initial posts seemed ambiguous.

[ray pampena]

Both with the still downpipe. The only difference is with and without the cat back

[DuTTch]

Originally Posted by VR3.9

So my cutout gave me 40hp. 360 vs 400.

I was there, saw it with my own eyes. hmmmm goodbye to my Tanabe catback maybelol. 16 awhp more is always good.

[vipershark11]

Cool to finally see some numbers. By any chance got a video? Bet it sounds badass.

[NickS VR4]

Originally Posted by ray pampena

I'm not maxed out. For the test I did 2 runs back to back. 23psi.

Stillen downpipe no cats.

Full exhaust 595
Open downpipe meaning no catback 611

I'm winter e85 so I didn't bother cranking it up

So in both setups, you had no cats? Or just the open downpipe?

If so that is a pretty significant power drop by having stock exhaust.

[VR4Drive92]

Can you post the two dyno graphs?

Did you notice any appreciable difference in boost threshold and spool up?

[wraith]

Thats actually not a huge difference in power at that power level. If you could say a typical aftermarket catback might lose you around 5-10awhp, then running the stock catback with an aftermarket downpipe and no cats is not killing you at anything under 600awhp.

sam

[ja3gt]

Interesting...