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Old 04-06-2015, 02:05 PM   #1
rocks31
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Gti exhaust on my 2.5L - 2.5" vs 3"

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?
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Old 04-06-2015, 06:51 PM   #2
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i have full 3 inch back, deep sounding.
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Old 04-06-2015, 08:19 PM   #3
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i have full 3 inch back, deep sounding.
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
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Old 04-06-2015, 08:23 PM   #4
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For future turbo application go with the 3", aside from that keep you 2.5 for a crispier sound.
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Old 04-06-2015, 09:26 PM   #5
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go 3'' if you're a man
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Old 04-06-2015, 11:05 PM   #6
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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
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Old 04-07-2015, 12:23 AM   #7
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3" lol
RIP torque
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Old 04-07-2015, 06:46 AM   #8
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3" lol
RIP torque
Would I lose tq by going with the 3"?
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Old 04-07-2015, 10:25 AM   #9
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Yes


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Old 04-07-2015, 01:20 PM   #10
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Okay that's the answer I was looking for, thanks a lot.
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Old 04-16-2015, 12:23 AM   #11
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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.
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Old 05-10-2015, 07:29 AM   #12
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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.
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
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Old 05-10-2015, 10:59 AM   #13
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Quote:
Originally Posted by rocks31 View Post
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

You will lose a noticeable amount of torque


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