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YOUR RESEARCHYou want loud:)? Bypass Pipes...
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Use same car
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And we used the same car for both applications and compared acceleration to a baseline car.
Leading evidence: 'Use same car' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Run 5 inch straight pipes off of the turbos' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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Suggestion · Original poster
I also run 5 inch straight pipes off of the turbos on my 996TT so I know where you are coming from..
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Suggestion
button willow and thunderhill are in BF egypt and you can run pretty much open.
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Suggestion
I may make a run with cats on someday when I have some time to see how they compare to the Supertrapps although I can't see adding all that weight back on the car.
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Suggestion
I may make a run with cats on someday when I have some time to see how they compare to the Supertrapps although I can't see adding all that weight back on the car.
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Outcome without a verified action link
I don't have the data in front of me but it worked out about the way I expected.
This guy needed more sound and actually it's probably what I would do instead on an exhaust on a 996. You loose 45 pounds and just go to a bypass pipe from Fabspeed, which is cheap. I can't remember what type of blue this is but nonetheless it's close to that RuF baby blue.... Nice cab but now it's a LOT louder. It's been a while since we did the bypass pipes.
It's got a distinct rumble upon start up but then settles down pretty quickly. It's actually not bad when putting around.. then when you get on it's cetainly loud
I wanted to get a clip of it today but sadly didn't get a chance and the car is gone. It'll be back some point or next time we do one I'll get a clip- promise!
They're 550 for the pair so cheaper than an exhaust
However, I would say you really need to listen and drive a car in person. I don't think they're for "everyday" personally
oh LORDY Jim. you do wear earplugs when you go racing right?
how is your HP/torque curves with the open exhaust?
looks like you need some equal length headers
Hey Carlos,
Yep, earplugs are required. It sounds great though.
I actually gained 13 hp and similar torque when I went from a setup like Sharkeys to straight pipes. All the power is above 5000. Below that the car just dies. That's ok for racing most of the time. You probably can't tell in the picture but I have Supertrapps so I can add backpressure if I am at a track where I need it.
I've wondered about some different headers. These are the ones that come with the X51 package. I should probably try a set of equal length.
Jim
hey jim,
i did notice the flanges for the the supertrapps. i may have to do a similar setup for tracks like laguna seca and sears point or any tracks that are within earshot of civilization. button willow and thunderhill are in BF egypt and you can run pretty much open.
your headers look like standard 996 fare. mine are sitting in the corner of the garage.
Hehe very cool indeed
(but you NEED headers) . I also run 5 inch straight pipes off of the turbos on my 996TT so I know where you are coming from.. I'll post pix. It's UGLY!
Those X51 headers look pretty nice to me. I don't think you'd get too much more pull-through exhaust scavenging considering how short the rest of your exhaust is. Look at the crap Porsche sticks us Boxsters with...
What I don't get is why are the Fabspeed pipes so much? I mean (and I own them) all they are is a 90 degree bent pipe with tips. Why doesn't someone else mandrel bend some stainless pipe and sell them for say $100 a set without tips (which could be mounted seperately)
That's my question. I can imagine that any good muffler shop could make them although I went to my local shop and they said they can't get that bend in stainless without kinking the pipe so maybe there is more than meets the eye but I wish someone here would chime in with a cheap alternative!
These are the headers that came with the x51 kit. If they are not the right one, I need to find someone to yell at. Maybe we could get a 40th owner to take a pic.
What's the diameter of the 996 exhaust? It looks like 2 1/8". I think I might have a relatively inexpensive, but nice solution. Depends on the diameter though.
Yeah, I know about that route. I'm talking about 304 stainless mandrel bends and tips from Borla. It's about $200 if I can get the 2 1/4" to work. Get the ends swaged down or something of the like.
If I understand correctly you could lose hp at lower RPMs due to a lack of backpressure? Is that correct?
Has anyone done a before and after dyno with the these?
I think Tq would be more in question than HP........ I would think you would gain HP at @ high RPM
***** Just read on their site that you get marginal gains...... 1-2 HP and a couple FP as well
FWIW, JimB is running a straight thru exhaust
i think any loss in torque you gain back in better handling. 50 lbs less from the rear would be much better at the track.
I haven't dynoed the car but there are three of us 996's that run together at the track and two of us have the bypass pipes and we definately pull the third guy with his stock exhaust. Now we have put in "Pep pipes" and will know if that does anything at 48 Hours. I let you know.
Carlos,
We're going to dyno the car on Wednesday at a few different levels of backpressure. It should be interesting.
Mitch,
Are you racing or doing the DE at Sebring? Either way, look me up. I'll be in the loud black 996.
Jim
i'd be interested in this since, i really can't justify paying the amount that fabspeed wants....not much really involved in them.....anyone know what the radius of that 90degree bend is, if so i can look into some options too.
I don't think it matters what the bend is, what is important is the inside and outside diameter. Look at the Fabspeed, it is a nice, but WAAAY overpriced, pipe.
so is there any truth to this i hear about the bypass pipes causing premature failure of the cats.... the only thing i can think of is the reduced back pressure causes damage to the cats, but thats just an attempt to find a cause to a supposed problem.....
STRASPEC - the bypass pipes will wake up your neighbors - by far your loudest option, but feeling any difference in hp is doubtful from any change in exhaust only.
I'll tell you this. On the track, we have done side by side comparisons of the bypass pipes vs. the stock Porsche exhaust. The bypass pipes are faster down the straights than the stock mufflers. No doubt. Now, this is wide open, high revving comparisons and so may not apply to street performance unless this is how you drive. And we used the same car for both applications and compared acceleration to a baseline car.
I don't have the data in front of me but it worked out about the way I expected. With restriction we gained a significant amount of torque from the start of the run up to 4700. From that point on the open pipes steadily gained both hp and torque peaking at 17 more hp and a similar amount of torque with the open pipes. The restriction was added by adding 16 Supertrapp plates which may not have been the most efficient but I still think the results are directionally correct. I may make a run with cats on someday when I have some time to see how they compare to the Supertrapps although I can't see adding all that weight back on the car.
We plan to run with open exhaust and focus on keeping the revs up for now.
Jim
