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Originally Posted by ChrisZang
I am assuming you mean this (see attached photo)
Dunno what's it called, but there used to be a few companies, which made hi-flow replacements; the only one that I am still aware of is around is AFE.
Google "AFE intake Boxster" and you shall find.
I am thinking about doing the mod but am not willing to pay $200 ~ $250 for a glorified piece of plastic. I also tried Pedro's mod http://www.pedrosgarage.com/Site_3/Make_a_Hi-Flo_Intake.html but wasn't happy with the result (actually more with my lack of skills in fitting plumping parts into my car).
So here's what I am planning to do this week:
I will re-use most of the original pipe and will get rid of the Helmholtz resonator. For that I will cut the pipe in two right in the middle between the rippled part and the resonator and will replace the shorter end with a 45 degree 3" silicon elbow pipe. This then turns this into a $20 mod
If you're interested I can let you know how it worked out |
Chris - I would be carefull about removing the Helmholtz resonator - I removed mine on my Mazda Miata and immediately lost about 25% of available torque below 4000 rpm.
It sounded better but after about a week I was convinced that I was missing something driving around town - I was, about 25 lb ft of torque which I immediately regained when I reconnected the resonator (they are removable on the Mazda). I thought that they were fitted for only noise supression but an ex Mazda man on the MiataForum confirmed that after lots of testing at the factory, the engineers found the sound wave harmonics actually improved cylinder filling at low to medium revs.