MK4 Turbo'd 2.0 options. What size?

483 Views 6 Replies 7 Participants Last post by bergenvr6, Feb 12, 2002

VertigoGTI

Discussion Starter · Feb 12, 2002

I'm getting a TT system, but I'm not sure as to go with the 2.25" or the 2.5". I'm not going too crazy with the system, only about 9PSI. Which size sounds more reasonable for a daily driven/ some autocrossing turbo'd AEG?
Remember that this system is for a 2.0 8V with a turbo kit, not a 1.8T punched out to 2.0 liters. Thanks!

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Bora18t

· #2 · Feb 12, 2002

Re: MK4 Turbo'd 2.0 options. What size? (vertigobora)

I'd say go with the 2.5"...turbos need as little backpressure as possible, regardless of the engine that you have.

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kyokoris

· #3 · Feb 12, 2002

Re: MK4 Turbo'd 2.0 options. What size? (vertigobora)

GO AS BIG AS you can get....i recommand 3" or even larger custom ones

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Cosmic631

· #4 · Feb 12, 2002

Re: MK4 Turbo'd 2.0 options. What size? (kyokoris)

TT 2.5" on mine http://****************.com/smile/emthup.gif

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TheSpilDog

· #5 · Feb 12, 2002

Re: MK4 Turbo'd 2.0 options. What size? (Cosmic631)

I had a TT but was not extremely happy with it for 2 reasons. One related to the TT and 2 not related.
1. Around the resonator area, it's 2.25 inch not 2.5
2. I had the stock cat
Last week, I changed my cat to a 2.5 inch high flow and removed the TT resonator and custom made a 2.5 inch straight pipe to replace it. All I can say, is wow, what a difference. On top of that, my EGT's dropped by another 150-200 degrees.

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