I'm looking for the 3" model weld-on tip 544-3003. Can't seem to find one anywhere. Supertrapp website seems to be geared totally to motorcycles. Whats the deal?
I'm looking for the 3" model weld-on tip 544-3003. Can't seem to find one anywhere. Supertrapp website seems to be geared totally to motorcycles. Whats the deal?
What are you trying to accomplish?
We did a big test on these a few years back and found them to be quite restrictive once you pulled enough plates to do much sound attentuation.
OTOH, they are great for plugging up the exhaust for street use while uncorked for the track.
A quick perusal of Summit shows lots of parts but only a few mufflers.
My intent is to plug up the exhaust for quiet street use. Summit shows this particular model "unavailable", as does the rest of the internet.
Summit sells them, but are not in stock. If they have it, someone's got one sitting on a shelf.
JJ's got new ones, the whole kit.
Those were popular when I was racing at Waterford in the late 90s because of the sound restrictions at that track. Personally, I never cared for how they sounded.
At the time, I wrote that SuperTrapp attained the rare combination of producing high back pressure And being loud. Overall, I had a very negative experience with them, and the final straw was while driving Kimini at Laguna Seca. I got black-flagged for being too loud, so removed some plates. It was still too loud and removed all but 2-3 - and failed a second time. When unscrewing the stainless* baffle screws (that had antiseize on them), one broke, so I headed back out lacking one screw. Note that this was their large and long unit, the one with both fiberglass stuffing and the baffles, so of course it started blowing the stuffing on-track. I was, and am, done with the product.
*Stainless fasteners are notorious for galling, essentially cold-welding themselves to anything stainless that they're screwed into. This is common knowledge but was news to me at the time. I was pretty annoyed with them that they apparently didn't mind handing the problem to buyers.
Might want to look into those tailpipe inserts. Summit has a variety...some with cones and others with spiral doo-dads.
Here's the kind NCM will help you with to meet their limits.
Tom_Spangler (Forum Supporter) said:Those were popular when I was racing at Waterford in the late 90s because of the sound restrictions at that track. Personally, I never cared for how they sounded.
That was usually drivers who also raced elsewhere, on tracks with looser sound requirements. I had a flange mounted Flowmaster, and could unbolt two bolts and one hanger to remove it. I had a straight pipe to replace it. I never went to another track, so it never got used. The Flowmaster had a unique sound, too. My sons could tell where I was on track without looking.
That NCM one looks great (not an ugly protruding piece). Whats the correct terminology to find one on Summit or elsewhere?
Supertrapps were popular with the dirt bike, ATV, and dune buggy crowd as they met the requirement for spark arrestors which are needed to run on federal lands, something that a lot of the straight through mufflers from FMF, Pro Circuit, etc did not meet.
They briefly made an appearance in the car scene because they were cool looking and unique so they fit in good with the pro street vibe of looks over performance, but not because they did anything well. Placing the muffler at the very end of the tailpipe isnt gonna muffle much.
Andy Hollis said:We did a big test on these a few years back and found them to be quite restrictive once you pulled enough plates to do much sound attentuation.
I believe this is the test Andy is mentioning for anyone interested: How to build an inexpensive, quiet exhaust that doesn’t cost horsepower
I have a Supertrapp sitting in the garage. Saving it for a period build, I guess.
There's a muffler triangle. At each apex is "low restriction" "quiet" "light". You have to pick a side. Supertrapps are really light.
They make the most sense on something like a Honda CBR929RR where you don't have or need much power, can get it nice and quiet for touring, and can improve the ride and handling by throwing away a cannon of a stock muffler.
I ordered one of these to stuff in the tip and give a try.
The guy who invented them is a kook who thinks physics doesn't apply to him.
Lof8 - Andy said:I ordered one of these to stuff in the tip and give a try.
We've had decent luck with these, not a huge sound decrease but definitely a noticeable difference. Usually registers 1-2db lower at 50' IIRC. If you get desperate and they're a tight fit, you can also use them to hold some steel wool in the end of the exhaust.
In reply to dps214 :
glad to hear it!
ShawnG said:The guy who invented them is a kook who thinks physics doesn't apply to him.
The crazy thing is that the Supertrapp was pretty much the only thing he did that had a return on investment.
That's not the crazy thing. The crazy thing is that he developed these loud yet restrictive mufflers to quiet down the EIGHT Wankel engines for the Skycar.
If one thing Wankels hate, it's exhaust restriction, and if there's one thing they need, it's effective muffling. So you'd think the Supertrapp would be somewhere in the pile of "didn't work" idea failures.
In reply to ShawnG :
He's definitely "eccentric" but I don't think he's done anything that flies in the face of physics. Unless trying to put a super-restrictive exhaust on a wankel counts.
In reply to GameboyRMH :
His VTOL aircraft. Too small and too underpowered to carry enough fuel to make enough power to be useful in terms of payload or flight time.
That's why they've all been a disaster for the better part of fifty years.
https://en.wikipedia.org/wiki/Moller_M400_Skycar
How he keeps getting investors to fund his pipe dreams is beyond me.
In reply to ShawnG :
Ha, I remember that thing from 40 years ago.
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