Gti exhaust on my 2.5L - 2.5" vs 3"

rocks31

Passed Driver's Ed

• Apr 6, 2015

• #1

Wondering if anyone has any knowledge on this topic. I am looking at buying a gti exhaust for my car. I have an apr intake, usp catted test pipe and will be tuning the car next month. All along I was planning on buying an ultimate racing exhaust which is 3" in diameter. But I can get a great deal on another gti exhaust which is 2.5". Will this 0.5" really make any difference? I'm assuming it won't make a heck of a lot of difference in power but what about sound? Anyone have any experience with this?

 

Tiggy1

Go Kart Champion

• Apr 6, 2015

• #2

i have full 3 inch back, deep sounding.

 

rocks31

Passed Driver's Ed

• Apr 6, 2015

• #3

Tiggy said:

i have full 3 inch back, deep sounding.

Click to expand...

Yeah that's what I wanted all along, but the deal I can get is real hard to pass up. It would make the decision a lot easier if someone could tell me there wouldn't really be any difference in the two lol

 

corrado917

Go Kart Champion

• Apr 6, 2015

• #4

For future turbo application go with the 3", aside from that keep you 2.5 for a crispier sound.

 

Tiggy1

Go Kart Champion

• Apr 6, 2015

• #5

go 3'' if you're a man

 

rocks31

Passed Driver's Ed

• Apr 6, 2015

• #6

Well I'm leaving the car NA, so I don't need to plan for a future turbo.

And if I wanted to prove I was a man I would have bought a pickup and put a 10" lift and 40" tires on it haha

 

mycrors7

Go Kart Champion

• Apr 6, 2015

• #7

3" lol
RIP torque

 

rocks31

Passed Driver's Ed

• Apr 7, 2015

• #8

mycrors7 said:

3" lol
RIP torque

Click to expand...

Would I lose tq by going with the 3"?

 

mycrors7

Go Kart Champion

• Apr 7, 2015

• #9

Yes


Sent from my iPhone using Tapatalk

 

rocks31

Passed Driver's Ed

• Apr 7, 2015

• #10

Okay that's the answer I was looking for, thanks a lot.

 

Krautwagen

Passed Driver's Ed

• Apr 15, 2015

• #11

You're going to be comparing 2 greatly different systems. Looking at just piping diameter, the 2.5" is going to be more than enough for a N/A 2.5l. However, I'm sure the aftermarket mufflers will be much less restrictive than the OEM GTI catback mufflers (they'll also be much louder, lighter, and not last as long). That said, the power difference will likely be negligible. If you want loud, go aftermarket. If you want quality and only a modest increase in noise, go with the GTI system.

 

rocks31

Passed Driver's Ed

• May 10, 2015

• #12

Krautwagen said:

You're going to be comparing 2 greatly different systems. Looking at just piping diameter, the 2.5" is going to be more than enough for a N/A 2.5l. However, I'm sure the aftermarket mufflers will be much less restrictive than the OEM GTI catback mufflers (they'll also be much louder, lighter, and not last as long). That said, the power difference will likely be negligible. If you want loud, go aftermarket. If you want quality and only a modest increase in noise, go with the GTI system.

Click to expand...

My question was how much difference 2.5" vs 3" would make performance wise, ex. loss of back pressure. Going with an oem exhaust was never an option. That's almost as restricting as what I have now lol

 

mycrors7

Go Kart Champion

• May 10, 2015

• #13

rocks31 said:

My question was how much difference 2.5" vs 3" would make performance wise, ex. loss of back pressure. Going with an oem exhaust was never an option. That's almost as restricting as what I have now lol

Click to expand...

You will lose a noticeable amount of torque


Sent from my iPhone using Tapatalk