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Seems to be some misinformation in some of the above few posts about exhaust size considerations with this kit.
To clarify...
The system will make more peak power with a 3" exhaust instead of a 2.5" However, only marginally.
BUT, this will be at the expense of low down power and spool. The turbo will NOT spool quicker with a 3" exhaust, over a 2.5" exhaust.
For the minimal top end gain, for the expense for low down power/spool, it is not advisable to choose a 3" system over a 2.5" system FOR THIS KIT.
On a similar point, where others have commented that the turbo will run out of power before a 2.5" becomes restrictive, this is basically true. What they are meaning is that a 2.5" exhaust system does not become significantly restrictive when compared to a 3" system at the power levels this turbo turbo is capable of. It's not like it reaches a magic point where one is better than the other, its like 90% of things on cars, its all about compromise.
The more boost this kit is running, the larger the peak HP difference will be between a 2.5" system and a 3" system, but the 2.5" will ALWAYS be better for this kit in a daily driven setup.
If you are track racing the car, a 3" system is probably a better choice for you, BUT, then you really have a mismatched exhaust system/turbo kit, and I would advise looking at a different turbo kit if you are chasing peak power.
Remember, dyno's are done are full throttle. And even worse, some people only focus on the peak power on a dyno graph. How often do you drive the car at full throttle, and at max revs on the street?
In short, a 2.5" exhaust system is perfectly mated to this turbo kit power delivery.
(FWIW, if you seriously believe a larger exhaust would help spool and low down power, then take the exhaust system off from the turbo back and go take it for a drive)
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