I was under the influence that if a car is mildly boosted such as <10psi, then getting the 2.5 in downpipe is better or equivalent to the 3 in downpipe in relation to horsepower increase. Is this true? In concise terms, for a msp at 9-10psi, would the 2.5 in or 3 in downpipe produce more horsepower?
2.5 in vs. 3 in downpipe??
- Thread starter turbolsd
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This is a very highly debated topic. So i will post my opinion and some fact behind it so you can come to your own conclusion.turbolsd said:
IMO if your peak boost is around 9-10 psi then 2.5 will be fine. Some people such as myself prefer a 3" downpipe on turbo chargers outlet for the higher pressure differential you get between the inlet of the turbine housing in relation to the outlet.
The larger the differential (without going to extremes) the faster the turbine will spool up. You also add a larger flow capacity to the system and allow for a higher HP potential at higher rpm's. If you are happy with just driving your car on the street and dont plan on any big mods in the future , or like to drive to the redline
every shift then 2.5 will be plenty. But i would suggest keeping it all thru the system 2.5"hope this helps
