If those are the comparable runs I'd say that Randall's engine was making less power than a normal bone stock 2.5 to begin with.

I've never seen a gain anywhere near 9Hp with the Chinese headers, in fact I've never seen a single system enhancement make that kind of power difference on that size engine.

What really tells the story is the data logged 0-60 and 40-80 MPH tests before and after the dyno with both systems at the same coolant and oil temperatures.

Jake, I'm not sure I follow that last statement, but I do value your opinions on this stuff.

I've wondered if I were to take it all off if I would have more power than I do now.

Well, would any one recommend a fabspeed intake or maxflow?

Ultimately it is your car, your dough and your choice. Ask 10 different Boxster owners and you will get 10 different opinions. Here is one opinion from a guy who did a lot of hot rodding in his youth (Ford, Chevy, Honda, Nissan), spent a small fortune on go-fast goodies over the years, and has too many track days to count:

Ignore all the shiny lures and bolt-on bits and just drive the car. They will not make you measurably faster. Get it to the track as often as possible and really learn to drive your car at it's limits. American muscle responds well to cold air intakes, chips, manifolds, FI, exhausts, cams etc. A Porsche Boxster responds well to driving skill and tires. Fix the loose nut behind the steering wheel first. Then get a nice set of sticky tires. :cheers:

Just one drivers opinion. Others will surely disagree. If you simply enjoy tinkering with your car, have at it. Some guys here have gotten results with bolt ons but usually it cost twice as much, took twice as long as they thought and fell short of their performance goals. I am a bit of a purist at this point. I have no interest in dyno slips. If it doesn't make my car more reliable or produce measurably faster laps, it doesn't go on my car.

I'm of the opinion, and my dyno results back this up, that there is power to be gained through the right headers, exhaust and software. Is it worth the money it costs to "do it right?" Probably not. In the end, however, I think it's worth noting that even if the car gained nothing, many people do enjoy and appreciate a different sounding exhaust on their car, and if that makes them happy, then that's all the assurance they need.

What should a healthy bone stock 2.5 be pulling?