<--- in the market for 3" downpipes with INTERNAL dump. external is fun for a few weeks - and that was several years ago for me!

 

Are these new downpipes replacing the cast Greddy pieces that come right off the turbos? I have seen some of the other offering on the market and they are more like 3" test pipe replacements along with moving the wastegates down to a more accessible area.

Has anyone addressed the cast elbow coming off the turbo (where the wategate dumps back into? It seems like that elbow should be addressed , too.

 

Im pretty sure Sharif was contemplating making 3" DP's with internal dumps for those interested in that.

 

I had SGP make a custom set of 3" down pipes and wastegate relocation pieces as well. I do not know if they sell these or not, but they originally had intentions of selling them.

 

Yeah, the initial production run will be a recirculating setup. We can easily adapt it for atmospheric dumps if the demand is there.

Alberto was lucky enough to get a prototype set of the externally dumped variety.

 

Ours bolts directly to the turbo, and transitions very quickly to a 3 inch pipe all the way down, and will bolt to your aftermarket exhaust systems. The wastegate on the driver's side is relocated, and the passenger side remains in the stock location. The only parts that we dont touch, are the greddy cast exhaust manifolds.

 

You say it bolts directly to the turbo, but then you say you dont touch the greddy cast manifolds? If it bolted directly to the turbo wouldn't you not sure the greddy manifolds? Am I reading this right?

 

Turbos bolt to manifolds, downpipes bolts to turbine (turbo), whats the issue?

 

Dude what are you talking about?

 

Thats correct.

 

O woops. I didnt relize that he was talking about the manifolds, I thought he was talking about the cast downpipes. My misunderstanding, all good.

 

What part of the exhaust will they bolt to ? To test pipes/hi flow cats or will they go right to the exhaust piping ? And will they only bolt up to 3" piping ?

 

The will bolt up to your cat-back exhaust system. Ideally, they should bolt up to a 3inch exhaust for maximum benefit. They can bolt up to smaller exhaust systems, but we dont recommend it.

 

How big of a difference should we see with these compared to 2.5 test pipes? What part of the powerband will be affected?

 

It depends on what boost level you are running. If you already have a 3 inch true dual exhaust, and install these pipes...maintain boost pressure at about 8psi, I would expect a 20-30ft/lbs and 20-30whp improvement across the entire power band. As you raise the boost, the power gains would be much more significant.

 

Very interested ! Please keep us here at the site updated. Looks like i will be selling my test pipes.

 

Can u elaborate more on y u dont reccomend...what about a 2.5inch exhaust? Any problems with that?

 

The main reason, is that the fitment between a 3 inch flange, and a 2.5inch flange can be hit or miss. We have done it before, and can figure out a way to keep it from leaking, but ideally, you want unrestricted flow all the way back. By tapering to the 2.5 inch exhaust, you defeat some of the benefit of running the larger downpipes....but you will still make gains at lower boost levels...even with a 2.5 inch exhaust.

 

Im really leaning towards a 2.5inch exhaust as i dont want to have a loud Z. Unless theres a way to have a quiet 3inch exhaust...lol

 

How about the Greddy EVOTT. It's a 2.75 inch true dual pipe, so noise wise, its very tolerable. Roncfp is running it on his car.