anyone intalled NHP full exhaust???

[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.

[Boxtaboy]

Originally Posted by 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.

Just a thought- can you reuse the factory u-pipes and clamps? That way, you could at least guarantee no leak. Maybe the aftermarket u-pipe diameter is a little bit smaller than OEM, which causes the leak?

[ddb]

Originally Posted by 2K3_Boxster_S

NHP exhaust is fully bolted up.

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.

2K3_Boxster_S:

I just recently bolted up the same system on my 2.7. Since the only parts to be reused were the double sleeve clamps, and mine tightened/loosened like crap a couple of years ago when I put on my first aftermarket muffler, I opted to install new ones. They are part # 996-111-110-01 that list for $32.50 and I was charged $22.24 by my local dealer. Do your double clamps have the wedges in them? Did you remove them? My new clamps didn't have them installed but the old clamps did I believe. Removing the wedges allows the clamps to be torqued down tighter and is in the instructions for the mid-pipe installation.

I did use the clamps NHP supplied from the U-pipe to the muffler. Again, I removed the wedges in the clamps and torqued them really tightly. I don't believe the instructions mention removing the wedges on these clamps but I did so anyway.

I've driven my car ~ 220 miles (including 70 miles this morning) and thus far no leaks and no CEL. I hope my luck continues.

I hope you get your problems sorted soon and I like many other are looking forward to your dyno results. My un-calibrated butt dyno tells me there is a marginal gain from the exhaust and BMC filter I installed on my 2.7. I believe I need an ECU flash to really feel the benefits and that is down the road.

Best of luck and let us know how it all turns out.

Boxtaboy,

I believe the u-pipes are slightly different and therefore not interchangeable.




ddb

[23109VC]

that is an expensive system for only "marginal" gains.

i've watched the youtube videos..they sound cool... but it's almost $2000 for that system and if all it does it "sound" cool and leak and throw CEL codes..no thanks.

I bolted up a used pedro muffler - bought from another member here - for about $150 and it sounds pretty good. not as good as the true aftermarket sy stems... but for $150 it was the best bang for the buck...

[ddb]

It's my understanding that any exhaust / intake mod will give you a marginal gain, if you're lucky. Some will probably cost you power.

In all fairness, any system, regardless of cost, is likely to leak or throw CEL, especially if not installed correctly.

Like I said, the real benefit will come when the DME is reflashed.

I'm sure your muffler mod sounds great! Probably better than mine.



ddb

[Jake Raby]

It takes several "Marginal gains" to add up to something of significance.
Even on our much larger engines we only see marginal gains from the current systems on the market.

I've been working on a development especially for our engines for several months now, because it has been clear to me for many moons that the sound and look are the most important characteristics of the current systems on the market.. Neither of these things are primary objectives for my engine program where effectiveness is paramount.

I see people spend 2K+ to make 2-5HP or even lose 20 HP with a certain system. A simple 200.00 crank pulley can easily give 10HP, but it doesn't add sound or isn't shiny.

[ddb]

Originally Posted by Jake Raby

A simple 200.00 crank pulley can easily give 10HP, but it doesn't add sound or isn't shiny.

I hear you. Once you've completed the R&D on your $200 crank pulley I will gladly install one for 10 HP! With that, I'll add whatever benefit from the 160 degree thermostat, exhaust and intake mods I've already completed, and DME reflash in the future. I'm working on the marginal gains hoping to one day add up to something significant (keeping in mind that my car is a 2.7 and not one of the larger displacement engines).

ddb

[blinkwatt]

Aren't the Boxster Spec racers gutting OEM mufflers then running straight pipes in them? I saw a dyno from one a few years back....something like +12hp and +17lbs of torque if I remember correctly. They have NOTHING to benefit from posting claims and such,so I wouldn't find their dyno runs biased.

Found it.
http://www.boxsterspec.com/spec-boxster-talk-f2-dyno-results-for-my-spec-boxster-t715.html

[Boxtaboy]

Originally Posted by ddb

2K3_Boxster_S:

Boxtaboy,

I believe the u-pipes are slightly different and therefore not interchangeable.




ddb

Interesting about the u-pipes. I guess the reason I thought they were interchangeable was because some people don't buy the full system, and instead just buy the NHP muffler alone, which I assume then they have to re-use the stock u-pipes. I guess the connection to the NHP cats might be slightly different then.

[ddb]

That is a good point Boxtaboy. You may very well be correct.

[2K3_Boxster_S]

Dyno scheduled Friday 8/28 9:00 am.

[Adam]

Originally Posted by 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.

So are you still getting the CEL? What are you going to do about the exhaust leaks?

[2K3_Boxster_S]

IMO: I would say there is a very noticeable difference in acceleration and throttle response. Take if for what its worth.

I stood behind the car with the stock and the NHP exhaust WOT. Video doesn't do it justice in the difference of sound and the quantity of hot air being blasted in my face.

Also, I am in no way trying to promote NHP. I think any decent header and exhaust set up would see the same results.



246 HP
218 TQ



Next: GIAC

[Adam]

246 whp/218TQ isn't too shabby especially without a tune. Do you still have CEL and exhaust leaks issues?

[2K3_Boxster_S]

Originally Posted by Adam

246 whp/218TQ isn't too shabby especially without a tune. Do you still have CEL and exhaust leaks issues?

after cranking all 4 clamps down as far as possible. still very small pinhole size leaks, feel air coming out. I will probably remove them re-position and try again. if that doesn't work, look for some different clamps.

If I am not mistaken (some one can jump in here) I believe when I take it to Richmond, VA to authorized GIAC dealer and its chip or flashed or whatever they do and tuned that they can eliminate the P0420 CEL. or if i am wrong, i know there are some other options rear O2 bung extensions.

the CEL doesn't bother me it has no effect on the car. would be nice to eliminate it though.

[j.fro]

Who is the authorized GIAC dealer in Richmond?

[cnavarro]

Update:

About 8,000 hard miles since May and two welds have broken on the muffler, one on the mounting bracket and the other on the heat shield.

The o2 sensor extensions have eliminated the CEL completely that appeared after about 6,000 miles with the sport cats.

[2K3_Boxster_S]

Originally Posted by j.fro

Who is the authorized GIAC dealer in Richmond?

http://www.lufteknic.com/