Hey guys,
Been just doing some reading up on the stock setup of the STi exhaust system and just need a bit of clarification.
Some parts of the system seem more restrictive than others, and some aren't that restrictive up until certain power levels.
Originally I assumed that to get noticeable power (lets say 50kw) above stock levels, I would have to replace the whole system but from reading some threads, even just replacing the dump results in a good increase in potential for gains.
Below is my understanding on the OEM setup (% means how important it is to replace):
(not sure if the centre pipe and Y are separate in the stock setup, was working off a HKS diagram)
Dump pipe - (2.5") Most restrictive part (80%) restriction most noticeable @ Stock
Centre Pipe - (2.5") Not too bad (10%) restriction most noticeable @ ??
Y-Pipe - (2.5" to 2x2") Not too bad (5%) restriction most noticeable @ ??
Sti Quads - (2x2") Least restrictive (5%) restriction most noticeable @ > 200awkw
If anyone can clarify/ confirm the information above, that would be great.
Around what power (awkw) is an aftermarket dump with stock CBE good for?
Around what power (awkw) is an aftermarket dump + centre pipe with stock Y pipe and mufflers good for?
For the GT guys, I'm guessing the only difference in the system is the mufflers ... Is the restrictiveness of the GT and STi muffers the same?
Thanks