Sorry for the old threat revival but in the comments section of this video there's a guy saying this is all BS, that this isnt sold anymore and dyno was manipulated. Any final consensus on secondary DPs?
Jonny,
I could write a book but here is short of it. Ignore HP gains, ignore those saying BS. The proper approach to our cars is a combined approach, more colder air in, remove waste better/faster. There are many benifits to this hp/tq is one a couple of them.
openning ur exhaust and reducing back pressure leads to quicker turbo spool times and better scavenging…
Scavenging is the process of replacing the exhaust gas in a cylinder of an internal combustion engine with the fresh air/fuel mixture for the next cycle. If scavenging is incomplete, the remaining exhaust gases can cause improper combustion for the next cycle, leading to reduced power output.
increasing airflow and temps into engine
(intakes/Ic) can increase power but also allow the turbos to create same amount of power at lower rotation speeds. The out put is cooler EFTs, exhaust gasses leaving through your cars exhaust.
I tell people not to thin linear like, I just added intakes so I can add 17hp to my power, it’s about the wholistic approach.
removing the secondary cats by installing the ark, or any mud pipes removed a bottleneck, allowing the gasses to flow better and other upstream systems to be just a little more efficient.
I ran lots of tests using my draggy.
8 different intakes (yes I am probably only person to run 8 different intakes, lol)
3 different exhausts with multiple configurations.
Most important I ran completely stick, stock with cutouts
Three aftermarket, cut outs on all three.
bottom line, the most restrictive part of our exhaust are the factory mufflers. I have AWD stinger which is rated 4.9 0-60
Using no paddle shifters, completely stock I was consistent at around 4.85, 4.9
Just removing mufflers I ran 4.7-4.76
Running ark mid pipes with aftermarket cat back I ran low 4.58
Running with paddle shifters I hit 4.5 flat and am sure could have gotten into 4.48-4.49 range.
I don’t care if mid-pipes on a dyno show a 5hp gain or a 25hp gain. If you are going to mod, add intake, IC, jb4(or other tune) mid pipes are worth it. If you are only going to change your exhaust and nothing else get rid of stock mufflers.
other note on mid pipes is they dip add a few nice gurgles when coasting.
side note on intakes. I’ve run the following
Injen
BMS
Agency Power
Jonny Tig
DYI
AEM
CXR
the plastic based intakes stayed cooler at idles buy 3-5 degrees (4 min idle test in 90 degree heat) Other than that performance was the same on all intakes. You can spend $98 on dyi and get same return as a $700 set of intakes.
conclusion on mid-pipes
My butt dyno says there is a noticeable gain when I added, since part of the fun of modding is the fun of modding and how it makes you feel driving your car, totally worth it!!
From the wholistic mod game, worth it…yes. But real gains would coming with removing stock primaries too which I will not do.
if others think not worth it that’s fine, knowing how GDI/turbo engines work I think it’s worth it depending in your overall plans/goals.
hopefully clear as mud
Cheers
stingerforum.org
