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2.5" bottle neck with my CTS catback and downpipe. Affects flow?

C

c3rolling

Passed Driver's Ed
Location
Santa Clarita
Hey guys, I was wondering if 2.5" connection from my 3" CTS catback to my CTS downpipe affects flow. Does the small section of 2.5" piping pretty much make the benefits of the 3" piping on the catback not effective? I heard an exhaust only flows as well as the smallest point.Thanks.
 
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7umberjackZac

7umberjackZac

Go Kart Newbie
Location
Pittsburgh, PA
Car(s)
Gti
GTI Jake

GTI Jake

Autocross Champion
Location
Charlotte, NC
Pretty crazy to spend over $1000 on 3” exhaust and have 8” of 2.5” in the middle lol

It’s probably not a measurable restriction, but it’s pretty Mickey Mouse to say the least
 
C

c3rolling

Passed Driver's Ed
Location
Santa Clarita
Gti jake said:
Pretty crazy to spend over $1000 on 3” exhaust and have 8” of 2.5” in the middle lol

It’s probably not a measurable restriction, but it’s pretty Mickey Mouse to say the least
Click to expand...

Yea It's because I bought both parts at different times. It would have been 3" all the way if I bought the full turboback from the beginning.
 
C

c3rolling

Passed Driver's Ed
Location
Santa Clarita
Yea not a big deal at all. I can just cut the ends off and use a 3" butt end clamp with a piece of pipe. Just wondering if it makes any difference, planning on going is38 or hybrid soon.
 
C

c3rolling

Passed Driver's Ed
Location
Santa Clarita
Well I did it. Cut off the section and added a 12" vibrant resonator and lap joint band clamps with some copper sealant. The resonator is 3" internal depth so I was able to slip the pipe into it before sealing and clamping. Zero leaks, less drone, and now a true 3" turbo back for about 60 bucks in added cost. Cutting the pipe was a pain on jack stands :(.
 

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7umberjackZac

7umberjackZac

Go Kart Newbie
Location
Pittsburgh, PA
Car(s)
Gti
c3rolling said:
Well I did it. Cut off the section and added a 12" vibrant resonator and lap joint band clamps with some copper sealant. The resonator is 3" internal depth so I was able to slip the pipe into it before sealing and clamping. Zero leaks, less drone, and now a true 3" turbo back for about 60 bucks in added cost. Cutting the pipe was a pain on jack stands :(.
Click to expand...
Good gawd, you are gonna have a lot of bolts to periodically tighten under that car. They all start to loosen, heat cycles. I know I'm living it

Sent from my SM-G935V using Tapatalk
 
GTI Jake

GTI Jake

Autocross Champion
Location
Charlotte, NC
lumberjackzac said:
Good gawd, you are gonna have a lot of bolts to periodically tighten under that car. They all start to loosen, heat cycles. I know I'm living it

Sent from my SM-G935V using Tapatalk
Click to expand...

Stock clamp or nah?

The Torca EasySeal clamps and their knockoffs don’t come loose when properly torqued, although I agree that is a mess of clamps
 
C

c3rolling

Passed Driver's Ed
Location
Santa Clarita
lumberjackzac said:
Good gawd, you are gonna have a lot of bolts to periodically tighten under that car. They all start to loosen, heat cycles. I know I'm living it

Sent from my SM-G935V using Tapatalk
Click to expand...

it's just one more clamp vs previous setup. Not sure what the big deal is. I never had issues with Torca type clamps.
 
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