anyone intalled NHP full exhaust???

[Jake Raby]

Cool.. I consider the AFR data more important during this evaluation than the HP output... But then again, I average HP numbers before I even look at peak numbers, because peak is so very worthless unless you drive around at above 5,252 RPM ALL THE TIME.

[2K3_Boxster_S]

Originally Posted by Jake Raby

Cool.. I consider the AFR data more important during this evaluation than the HP output... But then again, I average HP numbers before I even look at peak numbers, because peak is so very worthless unless you drive around at above 5,252 RPM ALL THE TIME.

Porsche has had my car since Monday (AC service) I get home from work today (Friday) "hey your car's ready". Not sure if I can get this done before 7/19. If not it's going to be another month. (out of town again, for work). I could just bolt up the exhaust, but I want to do this the right way. and from what every one has said about the Dyno sheets, something doesn't look right. which is why I insist on re-dynoing it.

This could take awhile. oh well,

[2K3_Boxster_S]

Ok, It didn't get done. I'm out of town again. return Aug. 15. It will be dyno'ed upon return on a roller dyno with AFR readings. Then NHP exhaust will then be installed and re-dynoed on same dyno. Sorry for the wait. But I feel an accurate baseline is needed so we can know what effects of the NHP setup is going to give us. Please hang in there. THANKS

here is a quote from the person who dynoed right after my on the same dyno:

"Yeah I thought yours seemed a little low even for a stocker.. but as they said that dyno is stingy. Dunno, mine dyno'd 90hp and 50ftlb down from last time.. but .. different style dyno, different conditions"

So yeah I'm gonna find a different dyno.

later

[2K3_Boxster_S]

Following has been installed:

5w-40 Castrol Syn

6 new Interpulse Plugs

NHP Full Exhaust installed

I can not tell specifically from driving on HP gains. I can say the back end broke loose like it never has before.

To me the sound is fine. if it gets to lound in the cabin all you have to do is go up a gear and it instantly quiets down to nothing. this is acceptable for me. but I also don't us the radio much.

try to dyno next weekend.

Old Beru Plugs

[cnavarro]

Long term update - probably a solid 8,000 mi on a full NHP exhaust on our '99 with sport cats. Cats started throwing a CEL about 2,000 mi and had to add o2 sensor extensions to fix the CEL. After the last track weekend, there's a rattle somewhere in the tip or mufflers, looks like their heat shield is coming loose.

[BYprodriver]

Originally Posted by cnavarro

Long term update - probably a solid 8,000 mi on a full NHP exhaust on our '99 with sport cats. Cats started throwing a CEL about 2,000 mi and had to add o2 sensor extensions to fix the CEL. After the last track weekend, there's a rattle somewhere in the tip or mufflers, looks like their heat shield is coming loose.

Did you buy the O2 sensor extensions? or did you make them yourself?

[cnavarro]

I could have made them, but I was lazy and just ordered them from FVD.

Did a quick search on google just now, there are cheaper options. Here's one I found:

http://www.tuneralley.com/megan-racing-mechanical-o2-sensor-extension-p-73047.html

[2K3_Boxster_S]

Originally Posted by cnavarro

Long term update - probably a solid 8,000 mi on a full NHP exhaust on our '99 with sport cats. Cats started throwing a CEL about 2,000 mi and had to add o2 sensor extensions to fix the CEL. After the last track weekend, there's a rattle somewhere in the tip or mufflers, looks like their heat shield is coming loose.

are the headers on the 99 the same as an 03? do you have 4 02's?

[2K3_Boxster_S]

NHP exhaust is fully bolted up.

Headers with sport cats, bypass mids, Exhaust.

Bolted up and fit perfectly. no leaks from headers or mids.

All four muffler clamps that connect the U pieces from the Mids to the rear exhaust LEAK!. THERE SUPPLIED CLAMP IS GARBAGE, and you re-use 2 of the OEM sleeve clamps which also leak. $2k the exhaust should not leak anywhere.

Next: they guarantee no CELS because all 4 O2's are reconnected. Wrong, after about 100 miles. now throwing a CEL, going to check it tommorow OBII scanner. almost sure it is going to say O2. will see.

Can't wait to here there explantion for the exhaust leaks. Gd dmn ridiculous.

Trying for DYNO with AFRS this FRIDAY. DPT tuning Chesapeake, VA.