Just a note on Exhaust mods, I have 'cheap' Chinese 304-t stainless headers w/o cats and they work very well on my 00' S. They fit perfectly and use 2" tube & are mandrel bent. The welding is as good as i've seen on any custom boat or car parts. I extended & relocated the 02's to fore & aft of the rear cats and did a 'pedro diy' drill out of the exhaust outlets, drilling 2 5/8" holes in each side, basically deleting the 3rd baffle in the muffler. I complemented that on the intake side with 3 1/2" silicone tubing into a large conical filter (big & cheap from local AP store) & a plenum I built out of lightweight remnants from a local plastic supplier, reusing the stock MAF tube & sensor. I will do a Porsche ROW (rest of world) flash on the chip to handle the unavoidable cels, & will have less than a grand into it. It just flies, & it sounds like pissed off hornets. Very slight resonance btw 2k-2800 rpm (i don't run @ less than 3k often). The Chinese have copied the best pipes, not the worst (duh). Folks who disaprove of these cheap mods have already spent way too much and are usually unskilled @ doing anything themselves. I have nearly as much fun tweaking the car as I do driving it. I does not have to cost a fortune if you get a Bently book & study online what u want 2 do b4 u tear into it. This is roadster ownership at its best!
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Originally Posted by The Radium King
hi there, i'm asking the dreaded exhaust question (again). i've seached the forum but can't find what i'm looking for.
i'm new to the boxster and new to this forum - hello everyone ...
i have a 2000 boxster s. i am looking to increase power; i intend to do the chip/intake/plenum mods and was thinking about exhaust. sound is secondary and exhaust components (typically) expensive.
questions:
1) it makes sense to me that a freer-flowing exhuast will reduce torque at lower rpm (less back-pressure) but increase hp at higher rpms when more air is moving through; is this valid?
2) the boxster s has a more tuned exhaust, and aftermarket exhaust will yield a smaller (if any) hp increase; valid?
3) where is most power increase found - header, sport cats, test pipe (secondary cat delete) or muffler? i could see headers being most beneficial, as more power would be seen through efficiency (equal length pipes)?
4) if i am increasing/improving airflow at the intake with improvements to the intake and plenum, would these benefits be increased with a freer-flowing exhaust (more are in, more air out)?
i quess i'm trying to drill down to whether exhaust mods are worthwile and, if so, which ones give the best bang for buck. and finally, whether a $76 ebay header is just as good as a $500 tuner header ...
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