Supertrapp Muffler rebuild

I picked up a Supertrapp Elite muffler off ebay for $70. As expected, it needed "work". All the threaded holes were seized/stripped so I had to put in threded inserts and refinish the whole muffler.

It went from this.




To this.




Part of the process included repairing damaged threads using aluminum, rivet type thread inserts (threadserts). Stainless were much more expensive and an online order. Besides, they are likely to get beat up and might corrode. Aluminum is easier to drill out/replace.




I believe the damaged threads were the result of either using copper based anti-seize on the threads, or none at all. I have ordered some proper NICKEL based, high temp anti-seize for my final assembly, but the aluminum thread inserts would be easy to replace if they seize or corrode. It's too big to attach, but I documented the repair as a .pdf file. I am a computer geek, after all.:typing:

I plan to mount the muffler this weekend and will most certainly put some audio up when she's breathing through her new stainless blow hole. :mechanic:

Jose

 

What do you plan do to with your other High mount?

 

The old can looks brand new and was probably purchased by the PO when had a low speed, lowside to the right.

If I end up REALLY liking this setup, I will probably sell off my existing CF micron can.

Jose

 

Let mw know I may be interested.

 

I got the new muffler mounted today. Here's a quick video to compare exhaust note.

[video=youtube;ioB_uSOyAkk]http://www.youtube.com/watch?v=ioB_uSOyAkk[/video]

There isn't a HUGE difference in exhaust note, but it is what I was looking for. The Supertrapp is just a little bit deeper and has that baby V-8 kind of sound. I can adjust later on for less backpressure and more bark, with tuning disks. I do believe I will be quite happy with this end result.

I'll keep you at the top of the list if I decide to sell the Micron can, ND.

Jose

 

This is a second file I recorded with a slightly better camera. Has better sound levels.

[video=youtube;fy5n8FKlaxM]http://www.youtube.com/watch?v=fy5n8FKlaxM[/video]

Jose

 

That sounds great!

 

Here is a quick pic of what it looks like now.



Jose

 

Sounds Awesome. I never heard the carbon fiber can so I don't have anything to compare it to except for stock.

 

Check out the video linked in post number 5. You have to turn it up, but you get to hear both pipes on the same bike, recorded by the same camera. The Supertrapp has a bit more bass in its exhaust note and when you spool up the engine, it is also a slightly lower and more muscular pitch. I really like the difference.

Jose

 

I'm thinking of going with a supertrapp... but they don't have our bikes listed on there. Definitely didn't want to go LOUD (our sirens engine is louder than this stock can) but a little louder and DEEPER is what I want to hear... gonna have to listen to the youtube clips at home (its blocked here at work.)

 

Sounds like the fuelling is off with both pipes, especially the supertrap at constant revs not much above idle. Get it on a dyno & get a custom map done, that said the supertrap makes that difficult as there is no where to insert the O2 probe !

 

That does look nice, well done.

 

If the Supertrapp plates start to rattle, the soft aluminum thread inserts are getting worn. The stainless are more money but a lot harder and if you blow out the stack of plates it will cost you even more. The nifty part is that if you do blow the stack the V4 really sounds great until the CHP busts you.

 

He could always move to south FL and maybe busted by the FHP. :tongue:

 

Living with the muffler for a while now .... I TOTALLY dig the look/sound and it's nice to hear some you are appreciative as well.

I plan to keep an eye on the inserts. Yea the SS ARE nicer, but MAN they are a pain if they gall/sieze and cost really is silly. With the nickel anti-sieze, I expect the muffler will come apart relatively easy and it will be no big deal to replace the aluminum inserts.

Yes, Mohawk. I need to go with a PCIII and tune for the pipe. The low speed stumble is REALLY pronounced with a nicely open pipe. I have a stock header, so there are dual O2 bungs.

In the end, the sound is VERY much what I want. Nice low rumble at idle and not overly loud at WOT. I highly recommend the setup.

Jose

 

Thats what I thought too until the whole stack let loose. I couldn't exactly hear the discs making a chiming noise as they hit the asphalt but the guy behind me told me that he did while ducking and before they rolled or sailed into the drink on Vashon Island.

I doubt the SS inserts are any worry for galling since you have not tried them and are really speculatiing. If anything any corrosion would be from the the bolts which are replaceable with SS.

BTW, the setup is on my SR-500. The 91 VFRF has a Yoshimura can, The BMW has a Black 2into1 Luftmeister. Sorry I just am unable to go bargain basement on my bikes.

 

It's not speculation on the galling, Billy. The reason I got the muffler so cheap was that the PO couldn't get it apart. I discoverd that was because the original SS inserts had galled onto the original SS bolts. It's possible he just didn't use any (or the correct type of) anti-sieze during a reassembly, but with aluminum inserts I don't have the same concern over galling. If they sieze up, I can cut the bolt heads off and possibly use a puller to bang out the insert, then just crimp new ones in. It would be better than full disassembly and grinding things off. Hell, I might just replace them regardless, if I disassemble for cleaning.

I totally understand your perspective on cost, but online order was the only way to buy SS threadserts and I wasn't sure what size I needed until I got some in my hands and could test fit from the 4 different sizes I COULD find. It's suprising that you didn't get signs the inserts were failing, given that there are 6 separate points that must fail simultaneously. Your buddy must have just about pooped his knickers when that disk pack came flying off. Those damned things aren't small OR light when they are stacked up.

Given your experience, I will definitely keep a close eye on the thread inserts.

Jose

 

Thats your story and you're sticking to it. Carpe Diem.