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Silverbullet
Yes, I can feel noticable performance gain over 4500rpm. Same power below 4500. Haven't dyno it yet, but the local Porsche club is doing a dyno day at the end of the month. I 'll post the results.
Never heard of the other brand, so I can't tell you much about it. One thing to note, the Evo is pretty hard to install. The Porsche shop quoted 2 hours to install and they actually took 5 hours. So get a firm quote if you were to get a shop to do it.
Adam, I have to agree with Silverbullet, I do feel the increase in performance and it sounds like a jet fighter when you floor the car. For $400 plus install, I think it's a nice upgrade.
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2000 Silver Boxster S
GPS Nav + 6 cd changer and rear speakers
Large leather package
Factory side skirts
18" turbo look wheels
Painted roll bars and centre console
Alumimum shifter and handbrakes
Litronic lights
B&M short shifter
Evo air intake
Turbo look bumper with C4S lip
Borla muffler
2nd Cat bypass pipes
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