I have the bypass pipes along with my Borla muffler. The combination is very loud and you have to get use to it. They claim increase hp, but I don't know since I dyno it with intake, muffler and bypasss. Search for my dyno results.
One more thing, we have emissions control here and I didn't pass, so I had to put the cats back for the test. Luckily, it's easy to install and it's only every 2 years.
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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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