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Jake Raby · 06-23-2009, 07:31 AM

OK, here is just a taste of some data..
All of this was gathered from the same 2001 Boxster S with 51,000 miles. The car was driven 125 miles after each swap to allow for the ECU to adapt to the changes and below is the results.

I have removed the names from the run files and will not give any information in public or private abnout which systems these were. I will only call them stock, Test system 2 and test system 3.

The stock system was exactly that, it was the system that came from the factory on the test vehicle and it had never been removed.

I will say that test system 2 was bought at a price of over 2,000.00 and the purchaser is one of my turn key engine Clients. He has sent a letter to the company about this poor performance, but they have not responded. This system had the least drone of all other systems tested on this car and helped drive ability the most, but as you will see my customer spent over 2K bucks to lose 20 HP.

Test system 3 is also another expensive system, costing even more than test system number 2. Test system 3 actually ended up giving us some performance over stock, but only after the intake air was freed up and an ECU flash was applied. It did have a nice sound but that wasn't part of my evaluation (although Db levels were data logged in the cabin from each system). It did have a nasty drone and when I put it on my test car my Wife wouldn't even drive it.. She said it was louder than her '79 Beetle that makes more power per cylinder than most any Boxster on this board and she drives it everyday.

Here is the legend for the plots:
(for the torque and HP plots attached.)

Red= Bone Stock 3.2 Boxster S exhaust system
Blue= Test system #2
Green= Test System #3

The first set of plots is just stock Vs the worst, the second set compares all 3 systems on the same engine.

This is just a taste.. None of these were the NHP system, I did not include it in these comparatives purposely.

06-23-2009, 07:31 AM	#34
Jake Raby Engine Surgeon Join Date: Aug 2008 Location: Cleveland GA USA Posts: 2,425	OK, here is just a taste of some data.. All of this was gathered from the same 2001 Boxster S with 51,000 miles. The car was driven 125 miles after each swap to allow for the ECU to adapt to the changes and below is the results. I have removed the names from the run files and will not give any information in public or private abnout which systems these were. I will only call them stock, Test system 2 and test system 3. The stock system was exactly that, it was the system that came from the factory on the test vehicle and it had never been removed. I will say that test system 2 was bought at a price of over 2,000.00 and the purchaser is one of my turn key engine Clients. He has sent a letter to the company about this poor performance, but they have not responded. This system had the least drone of all other systems tested on this car and helped drive ability the most, but as you will see my customer spent over 2K bucks to lose 20 HP. Test system 3 is also another expensive system, costing even more than test system number 2. Test system 3 actually ended up giving us some performance over stock, but only after the intake air was freed up and an ECU flash was applied. It did have a nice sound but that wasn't part of my evaluation (although Db levels were data logged in the cabin from each system). It did have a nasty drone and when I put it on my test car my Wife wouldn't even drive it.. She said it was louder than her '79 Beetle that makes more power per cylinder than most any Boxster on this board and she drives it everyday. Here is the legend for the plots: (for the torque and HP plots attached.) Red= Bone Stock 3.2 Boxster S exhaust system Blue= Test system #2 Green= Test System #3 The first set of plots is just stock Vs the worst, the second set compares all 3 systems on the same engine. This is just a taste.. None of these were the NHP system, I did not include it in these comparatives purposely.