"but I can say that adding headers and an aftermarket exhaust show little, if any, gains on the dyno unless remapping of the DME is involved. Even after remapping, on the examples we have been involved with showed what I would describe as "modest" improvements, but not spectacular jumps. At the end of the day, the owners spent a lot of money, obtained slight improvement,"
Yes, and yes, that is exactly what I have found and I did a lot of mucking around with intakes, custom chips, exhausts and three different mufflers. These are not easy cars to get hp out of, if I recall it cost
Intake 1.2K+
Chip 1.2k+
Full exhaust 4.0K+
This is with a 2000 base boxster and when all the dust settled I picked up between 20-25 hp and lost about 2 mpg highway mileage. I did most of this work a couple of years ago when I had some funds left over by getting a good price on the car.
With short shift kit, lighter overrall car weigh and light flywheel (Yikes!), the car is certainally more responsive and fun to drive, and my exhaust sounds great to me and does not have the resonance issues. But would I do it again knowing what I know now, no way. I would just put on a nice set of Bilstein coilovers, nice sticky 18"wheels and enjoy the ride....
Ed
