anyone intalled NHP full exhaust???

[2K3_Boxster_S]

Originally Posted by 23109VC

everytime I go on ebay i see that exhaust system, and the video they have - and I want to buy it. it sounds sooooooooooooooo cool.

does this thing drone like nuts?

on a base 2000, would their FULL system...the one that is $2200 and has everything.... including cats so here in CA, I ccan still pass smog - would it REALLY make ANY power I would feel or is it just going to sound cool and do nothing for speed?

lighter than stock?

1. Not sure about the smog pass. they are 200 cell CATS versus a oem CAT which has about 600 to 800 cells. you may or may not pass. I dont have do worry where I live.

2. wait for the Dyno results, Pre and Post install results will be posted here in the next 2 weeks.

3. they advertise little cabin drone. but I will post those results as well. and I have a little solution for that as well if it is needed.

4. yes, its lighter you are getting rid of the boat anchor in the rear of the car. the system you are talking about with all 4 sport CATS is 20LBS lighter. even lighter if you delete the rear CATS.

stay tuned

[2K3_Boxster_S]

UPDATE

I know a few people are following this thread. I'm on a plane tommorow. and have the Base line dyno scheduled for Friday July 3. Will post vid results. Then should be able to intall Full NHP following weekend.

results coming soon

thanks

[2K3_Boxster_S]

going to dyno tommorow. (pre-install numbers)

Unwrapped parts. Excellent quality. welds look great. good penetration. heatshields on the mid pipes and the mufflers. gaskets for everthing included.

[23109VC]

i'll be anxious to see the results!!!

you have an S - my car is only a 2.7L base - 217hp...so whatever gains you see - i'll have to expect less.... lets hope you see massive gains!!

are you doing any kind of ECU flash or just bolting on the system? is your system the entire thing - headers/midpipes/muffler?

[Adam]

The parts look high quality and the tubing diameter is noticeably larger than stock. Definately interested in the results.

[2K3_Boxster_S]

Dynoed Today on a Dynapack, so there would be no questions about variables. there are no tension straps, no rollers, wheel spin, deflection etc.....

Dynapack info:
http://autospeed.com/cms/title_The-Dynapack-Dyno/A_0930/article.html

Video Results of my stock 2003 Boxster S:

http://s80.photobucket.com/player.swf?file=http://vid80.photobucket.com/albums/j179/ryancausey/boxterfinal1.flv&fs=1&os=1&ap=1



Looking at back on Dyno in 2 weeks Full NHP installed.

[23109VC]

can't wait for the results!!!! thanks for doing this - i'm sure I"m not the only one anxious to see the results. I'd also like to hear how it sounds.

aside from dyno numbers - I'd be interested in your subjective impressions as to how it seems to drive/perform - seat of the pants observations.

[2K3_Boxster_S]

Originally Posted by 23109VC

i'll be anxious to see the results!!!

you have an S - my car is only a 2.7L base - 217hp...so whatever gains you see - i'll have to expect less.... lets hope you see massive gains!!

are you doing any kind of ECU flash or just bolting on the system? is your system the entire thing - headers/midpipes/muffler?

1. I am doing this at a 1 step at a time approach. (yes I will be altering the ECU maps, custom tuned. but later) The reason is I want to know as well as others whether Porsche has detuned the boxster through the exhaust or the ECU or quite possibly both. (Porshce did not want Boxter's threatening there 996 owners).

2. Yes, 1st stage is strictly bolt up exhaust that should determine if flow is restricted anywhere.

3. Yes it is Full NHP exhaust as follows:

Headers:
Equal Length primary piping, mandrel bend
Racing merge collector for primary piping
42mm primary piping vs. 36mm stock piping
200 cells sport catalytic converters vs 800 cells factory
2 inch exit pipe vs. 1 3/4" stock exit pipe

Mid Pipe Bypass pipes:
Completely removing rear CATS
50mm versus 40mm diameter

Exhaust:
304 Stainless Steel this muffler is a straight through pipe design
there are no internal baffles

[Topless]

Yikes! Looks like a huge hole in performance at 4300 rpm. Low numbers for a Box S also. Bad MAF??? Spark plugs?? I have seen a lot of Boxster dyno results. Something looks very wrong here.

[stateofidleness]

i know nothing about dyno's and such, but 186hp on an "S"?
I thought my MY00 stock 2.7 was rated at 210hp... is yours low, or is mine high?

seems like the S should be putting out a lot more, even a stock one.

[edevlin]

Interesting stuff, keep the dyno sheets comming....

Ed

[2K3_Boxster_S]

Originally Posted by Topless

Yikes! Looks like a huge hole in performance at 4300 rpm. Low numbers for a Box S also. Bad MAF??? Spark plugs?? I have seen a lot of Boxster dyno results. Something looks very wrong here.

nothing wrong with the car it runs great.

[2K3_Boxster_S]

Originally Posted by stateofidleness

i know nothing about dyno's and such, but 186hp on an "S"?
I thought my MY00 stock 2.7 was rated at 210hp... is yours low, or is mine high?

seems like the S should be putting out a lot more, even a stock one.

its horsepower to the wheels, not what the engine can make. Those numbers put my car around 250 hp.

[2K3_Boxster_S]

Originally Posted by Topless

Yikes! Looks like a huge hole in performance at 4300 rpm. Low numbers for a Box S also. Bad MAF??? Spark plugs?? I have seen a lot of Boxster dyno results. Something looks very wrong here.

go put your car on a dynapack and lets see whats going on.

[Topless]

Here is another dynapack run with a bone stock Boxster S for comparison.
http://i4.photobucket.com/albums/y144/bisimoto/DeSnorked986S.jpg

Do you see what I mean about your cars hole at 4300 rpm(down to 140 ft lbs)? Peak performance is much lower on your run also. I am not here to burn you down. I just figure if you want to get a good baseline run before tuning your car it should look similar to other stock Box S runs to be valid. Looking at your numbers I suspect a fouled/contaminated MAF.

[Topless]

Here is another run with a well tuned 98 Boxster spec car. The motor is a stock 2.5L crate motor that was recently installed. This run was under ideal conditions on a cool morning at sea level. These are the best results I have seen with a stock 2.5L. Note the big fat torque curve at 4500 rpm. This car sings.

http://www.boxsterspec.com/uploads/monthly_01_2009/post-49-1232326727_thumb.jpg

[Jake Raby]

Hmmn, very interesting.

Take it back after a few hundred miles and see what happens. Where is your AFR data?

Topless,
Around 190 at the wheels on a dyno jet is about the max one can see without induction work. I have gotten 200 on my dynojet with an enhanced induction arrangement, totally discarding the stock 2.5 plenums and runners as well as the throttle body.

Even with a camshaft change (read as 4 different cam sets designed by me) won't make much more power at all (just move the power up) over 190 at the wheels..

My daily driver 2.5 test car is now at 194 with a bone stock exhaust system..

[2K3_Boxster_S]

Originally Posted by Topless

Here is another dynapack run with a bone stock Boxster S for comparison.
http://i4.photobucket.com/albums/y144/bisimoto/DeSnorked986S.jpg

Do you see what I mean about your cars hole at 4300 rpm(down to 140 ft lbs)? Peak performance is much lower on your run also. I am not here to burn you down. I just figure if you want to get a good baseline run before tuning your car it should look similar to other stock Box S runs to be valid. Looking at your numbers I suspect a fouled/contaminated MAF.

hmm. yes I see what you are saying. your dyno sheet drops at almost the same exact point. not nearly as drastically though 10Lbs i think. I'm also looking at a difference in the Rpms and Mph, don't think that matters though. If its a plug or MAF you can not tell by driving the car. Plus shouldn't you get a CEL if it was the MAF?

[Jake Raby]

Originally Posted by 2K3_Boxster_S

hmm. yes I see what you are saying. your dyno sheet drops at almost the same exact point. not nearly as drastically though 10Lbs i think. I'm also looking at a difference in the Rpms and Mph, don't think that matters though. If its a plug or MAF you can not tell by driving the car. Plus shouldn't you get a CEL if it was the MAF?

There are lots of issues that can reduce output without throwing a CEL.. some of these are MAF issues, others are fuel pressure or fuel injector related and even issues with catalytic converters.

Or a low power engine may have an impending mechanical issue... I haven't ever seen a healthy Boxster S engine that didn't make at minimum 205HP at the wheels.. That engine was very tired with near 30,000 track miles on it.

[Adam]

183 hp and 177ft/lb at the wheels? Something is definately wrong with the car or the way it was dynoed. This 2003 S at fabspeed dynoed 229 hp and 203 ft/lbs at the wheels...bone stock.

http://www.fabspeed.com/Boxster.html