Hello Fellow Evo Enthusiasts,

I'm looking at purchasing a new downpipe and I’m stuck and I really don't know which one to get.

I know AMS claims ""The AMS EVO X "Wide mouth" downpipe is the most power producing and well designed downpipe on the market""

and ETS claims ""This downpipe has been engineered to be one of the highest flowing downpipes on the market""

However I’m stuck.. I know the ETS is more money and Louder under WOT but is it worth the extra money?

I can tell you this will be one of my last mod.. I currently have ETS intake, ETS UICP, ETS LICP, AMS high flow cat, HKS hi power exhaust.. and don't plan to go bigger turbo, built motor, or anything crazy like that.. Maybe an intercooler later on..

So basically would the extra money and extra noise from the open dump DP be better for my setup or would the AMS produce around the same power without the WOT noise?

Thank you guys..

 

Go with the ETS downpipe. A 02 dump helps eliminate back pressure within the 02 housing. The by product of this is the ability make more power even more efficiently. And the dump isn't that loud unless you're just driving WOT all the time.

 

The only other issue that might play a role is whether you ever plan to autocross. The SCCA does not allow exhaust to be dumped under the car.

 

thats good to know as well.. but no I would not be doing any autocross.

 

On stock turbo, both produce the same power (+/- margin).

The difference is AMS will be stronger due to it's cast nature... But ETS is well designed, and they will back their products as well.

You can't go wrong with either, but since you have an AMS high flow cat, you might as well be consistent and get the AMS dp.

Or just save your money, since dp on stock turbo = minimal gains.

Edit: Also, you might find open dump annoying if you DD the car.

 

I owned both had the AMS 1st switched to the ETS but the ETS let me hold boost at higher rpm so I kept that.

 

Wut... What does DP have to do with holding boost?

 

Better flow across the turbo produces more peak boost. The downpipe is critical to said flow. Connect the dots.

 

The guy said holding boost, not peak boost.

And as for peak boost, that's true, but that'd be for bigger turbo applications. There's not enough flow on stock turbo for an aftermarket downpipe to affect anything significantly, though. The only real gains from the aftermarket downpipes would be slightly better, smoother, and more direct angle at which the air flows.

 

There's plenty of flow on a stock turbo for there to be gains, just go ask either AMS or ETS for a dyno sheet. I picked up roughly 30whp on my IX from simply swapping my recirculated 02 housing for a 02 dump. And guess what happens when you have "slightly better, smoother, and a more direct angle at which the air flows," you make more hp and tq.

 

1. They don't have dyno sheets for just the DP. But I did happen to do VD logs before and after DP and FMIC replacement on the X. Guess what the result was? Minimal gains from DP.

2. 4g63 vs 4b11t, guess which one is better flowing stock?

 

By "peak boost" I meant holding the highest level of boost. But you knew that.

 

I'm aware of the differences between the two blocks, but at the end of the day gains are gains and you're making the most out of your stock turbo.

 

Sorry, I was a little confused at what you're trying to say. "Peak boost" is just the highest level of boost your car hits, as set by target boost in tune. That isn't the same thing as the max a turbo can spool. For example, at lower RPM's, the turbo can push way more than the average 24-26 psi most people run on stock turbos. However, we limit the "peak boost" to that number. And then further up in the RPM range, you hold this "peak boost" until the turbo can no longer keep up and flow that much air... The only way to "hold the highest level of boost" longer, is by upgrading to a larger turbo which can flow more air and keep up at higher RPM's.

That's true But for some of the ballers on a budget, ~5whp isn't worth the $400 + labor time for a downpipe.

 

I autocross so the open dump was not an option. I also have a professional job so driving a car that sounds like a 87' Buick Regal with a leaky exhaust manifold was not an option.

Why go with a open dump DP if you have a high flow cat? If you are thinking about running an open dump, I would switch to a test pipe also.

OMG AWD - I have a brand new ETS recirculating DP in my basement collecting dust. PM me if you're interested in keeping your cabin from smelling like exhaust.