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Full 3" exhaust?

Messages
86
Reactions
38
Location
NJ
#1
So SPD's downpipes are 3", but all the exhausts that I am seeing are 2.25" or 2.5". Does anyone make a full 3" exhaust to mate with the 3" SPD downpipes?
 
Messages
282
Reactions
130
Location
Henrico, VA
#2
So SPD's downpipes are 3", but all the exhausts that I am seeing are 2.25" or 2.5". Does anyone make a full 3" exhaust to mate with the 3" SPD downpipes?
Nope


Sent from my iPhone using Tapatalk Pro
 

dolsen

Member
U.S. Marine Veteran
Messages
105
Reactions
39
Location
Louisville, KY, USA
#8
You'll have more flow but less back pressure which can lead to turbo lag.
By no means am I an expert with turbo charged engines. I was always led to believe that with turbo charged engines back pressure was not a necessity. Can you elaborate just a little on that? I'm not doubting you, nor do I expect an in depth explanation, but I am curious and I want to be corrected if my "knowledge" is incorrect.
 
Messages
86
Reactions
38
Location
NJ
#10
You'll have more flow but less back pressure which can lead to turbo lag.
Trust me, I have built a lot of turbocharged motor vehicles, from 1,000+awhp Nissan GTR's to 625rwhp turbo Suzuki Hayabusas. Larger diameter exhausts on turbocharged vehicles is always a better thing. Obviously you aren't gonna run a 4" exhaust on a busa for example, but a 3" full system on an ST will absolutely improve power.
 

boiler662

New Member
Messages
22
Reactions
9
Location
Houston, TX, USA
#12
Anyone know the setup Porsche uses on the Macan? Slightly bigger engine that sounds pretty damn good for a factory exhaust.
 

Sch0227

New Member
Messages
14
Reactions
5
Location
Dallas, TX, USA
#13
Anyone considered the SPD Downpipes and electronic cut outs w/ the factory exhaust?

party on the streets, quiet in the garage..
 
Messages
205
Reactions
121
Location
Ellicott City, MD, USA
#14
Anyone considered the SPD Downpipes and electronic cut outs w/ the factory exhaust?

party on the streets, quiet in the garage..
considered it, then gave up. by the time i priced out the valves, custom mandrel bent tubing, solenoids, wiring, etc. i was well over $1000.

That being said, a setup like this would be AMAZING and I hope someone does it.
 

SpeedOften

New Member
U.S. Navy Veteran
Messages
24
Reactions
11
Location
Londonderry, NH, USA
#16
By no means am I an expert with turbo charged engines. I was always led to believe that with turbo charged engines back pressure was not a necessity. Can you elaborate just a little on that? I'm not doubting you, nor do I expect an in depth explanation, but I am curious and I want to be corrected if my "knowledge" is incorrect.
More backpressure leads to lag, less backpressure less lag.
 
Messages
57
Reactions
37
Location
Mons, Belgium
#17
Hey folks, just wanted to throw an update on here. I’ve had a custom exhaust installed, finally. Thanks to COVID it’s taken longer than expected. It’s a cat-back, x-pipe, no resonator, into single-in, dual-out custom mufflers. 3” mandrel bent, welded all the way through. Tips are 3 1/2”.

It‘s perfect for me...not obnoxious, but is loud enough to turn heads and is pretty throaty. The only thing I may change are the tips. I’ll stick with 3 1/2, but might switch to something a little more refined. We will see. Here are some videos...not the best audio, so we’re working on improving it.

I also have the Palm Beach Dyno tune and a drop-in K&N air filter, along with H&R springs.
 

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Kruppa

New Member
Messages
15
Reactions
4
Location
Grosse Pointe, MI, USA
#19
Hey folks, just wanted to throw an update on here. I’ve had a custom exhaust installed, finally. Thanks to COVID it’s taken longer than expected. It’s a cat-back, x-pipe, no resonator, into single-in, dual-out custom mufflers. 3” mandrel bent, welded all the way through. Tips are 3 1/2”.

It‘s perfect for me...not obnoxious, but is loud enough to turn heads and is pretty throaty. The only thing I may change are the tips. I’ll stick with 3 1/2, but might switch to something a little more refined. We will see. Here are some videos...not the best audio, so we’re working on improving it.

I also have the Palm Beach Dyno tune and a drop-in K&N air filter, along with H&R springs.
What are your thoughts on power gain? Anything you can notice? Very curious on low end power...any noticeable loss? See so much conflicting info on here and debating 3” vs 2.5” really only concern is potentially losing low end - I do more 0-60 messing around than 1/4 mile, high speed racing
 
Messages
114
Reactions
72
Location
Los Angeles, CA, USA
#20
Hey folks, just wanted to throw an update on here. I’ve had a custom exhaust installed, finally. Thanks to COVID it’s taken longer than expected. It’s a cat-back, x-pipe, no resonator, into single-in, dual-out custom mufflers. 3” mandrel bent, welded all the way through. Tips are 3 1/2”.

It‘s perfect for me...not obnoxious, but is loud enough to turn heads and is pretty throaty. The only thing I may change are the tips. I’ll stick with 3 1/2, but might switch to something a little more refined. We will see. Here are some videos...not the best audio, so we’re working on improving it.

I also have the Palm Beach Dyno tune and a drop-in K&N air filter, along with H&R springs.
can you get pictures of the underside of your car? im having a hard time understanding what you mean by X PIPE single IN and double out....

sounds pretty good though. got a nice deep grunt to it.
 


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