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Thu Oct 21, 2010 5:02 pm

I have an Empi Phat Boy, and Empi merged. The phat boy makes my engine fall on its face at around 5500rpm, whereas with the stinger I can take it to the rev limiter at 7300 rpm. Granted the stinger will outflow most, if not all mufflers on the market today. I just want to know if anyone else has experienced the same problem.
My engine combo is 1776cc, with dual 40 dells, w130 cam, ported and polished heads stock valve size.

Thu Oct 21, 2010 5:09 pm

It has to do with the arrangement of the baffling inside particularly Empi fatboy mufflers. I made the mistake of buying one and it blew out fiberglass particulates. Very very annoying and itchy. Swapped to a Bugpack and never looked back. Empi muffler systems really suck. Return it if you can.

Mon Sep 19, 2011 4:32 pm

I talked to some guys at BOR 68 and we matched up an empi merged muffler with a bugpack merged header, and it "looked" like the same flange orientation. I was thinking of getting the bugpack mondo muffler or getting a magnaflow round muffler. I need more space down there because I am now running a homemade traction bar.

Mon Sep 19, 2011 9:09 pm

I had a Bugpack on my 1776 and recently replaced it with a merged fat boy muffler for better fit. I feel like the fat boy has less restriction than the Bugpack and I can now hear alot more small noise from the motor than I could before such as mild afterfire etc. I'm in the same boat though I might do something custom with a round or oval Magnaflow, or even bend up a single quiet pack to work with y merged setup.

Mon Sep 19, 2011 11:25 pm

http://www.summitracing.com/search/Part-Type/Muffl...toview=SKU

I've got one of these bullet-type mufflers. Very low restriction, very cool sound, and it's actually rather quiet until you stomp it. It's not appreciably louder than the super-restrictive brand-x muffler from Advance Auto I was running before. Of course, if you get a bullet muffler, you'll have to fab your own bends.

Tue Sep 20, 2011 2:34 pm

EdgeKid3 wrote: I had a Bugpack on my 1776 and recently replaced it with a merged fat boy muffler for better fit. I feel like the fat boy has less restriction than the Bugpack and I can now hear alot more small noise from the motor than I could before such as mild afterfire etc. I'm in the same boat though I might do something custom with a round or oval Magnaflow, or even bend up a single quiet pack to work with y merged setup.

you were running the mondo muffler? The fat boy from Empi started blowing out the packing and started to sound more and more staccato. Thats when I started feeling the restriction at the upper rpm band. It sounded really good before but once the packing started to go out of it then it kind of went downhill. I was just looking for something with more flow. I don't really care about the how loud it is, I am just looking for something that will fit, look good, sound good, and give me more life/ consistent power output.

Tue Sep 20, 2011 4:14 pm

Yes I had the mondo style, but the bend isn't as nice as the one on the fat boy for merged, so I went with the cleaner look. I have to say I like the sound of the Bugpack better, and so far the performance as well. Overall I think these Turbo style 3" piped mufflers are made for engines making more output than a 1776 like mine, and smaller engines should stick with simpler or smaller tubed headers and mufflers. That's why I'm now leaning towards a quiet pack style system, or a glasspack like I have on my 40hp. Both sound nice enough but not ignorant.

Wed Sep 21, 2011 1:53 pm

I had the same problem so cut off that crap muffler and weded on a Flowmaster Super 44 and never looked back!

Thu Sep 22, 2011 11:14 am

yama14 wrote: I have an Empi Phat Boy, and Empi merged. The phat boy makes my engine fall on its face at around 5500rpm, whereas with the stinger I can take it to the rev limiter at 7300 rpm. Granted the stinger will outflow most, if not all mufflers on the market today. I just want to know if anyone else has experienced the same problem.
My engine combo is 1776cc, with dual 40 dells, w130 cam, ported and polished heads stock valve size.

In my opinion, that cam is way mismatched for those heads...

Thu Sep 22, 2011 12:32 pm

my merged phat boy is the opposite of all the merged Bugpack mondos in our club. Most of us with phat boys hate them! Mine has been ridiculously loud since the day I bought it. Mine also shot out little black bugar looking fiberglass bits. The Mondo mufflers usually have a lot better turbo kind of sound and more quiet than phat boy garbage. Bugpack mufflers are USA built and far better workmanship than Empi trash. My dual Bugpack quiet pack is so quiet, you can hear the engine and carbs over the sounds of the muffler.

Thu Sep 22, 2011 1:48 pm

smitty24 wrote: my merged phat boy is the opposite of all the merged Bugpack mondos in our club. Most of us with phat boys hate them! Mine has been ridiculously loud since the day I bought it. Mine also shot out little black bugar looking fiberglass bits. The Mondo mufflers usually have a lot better turbo kind of sound and more quiet than phat boy garbage. Bugpack mufflers are USA built and far better workmanship than Empi trash. My dual Bugpack quiet pack is so quiet, you can hear the engine and carbs over the sounds of the muffler.

Yep, it's true, EMPI = shit, generally speaking. Forgot to mention that in my last post. Exhaust systems have always been problematic where EMPI is concerned.

Thu Sep 22, 2011 8:28 pm

I forgot to mention...I also had bought a 1 5/8" merged header when I got the ceramic phat boy. It was a package deal at a decent price. What a joke. I had to cut and reweld the SOB in multiple spots and reposition, since the damn J piping was literally touching the bottom of the heads. The flanges were not even close to the designated bolting positions, even remotely. To think I was to save money with Empi, boy was I stupid!! Buying a whole system from Bugpack or one of Lowbugget's setups would of been smarter and much cheaper to deal with, rather than wasting all kinds of time and money welding. Empi must have hired a bunch of blind apes to build my system. Im surprised my forged chromoly flywheel hasnt exploded, yet!

Thu Oct 20, 2011 5:54 pm

bugnut68 wrote: yama14 wrote: I have an Empi Phat Boy, and Empi merged. The phat boy makes my engine fall on its face at around 5500rpm, whereas with the stinger I can take it to the rev limiter at 7300 rpm. Granted the stinger will outflow most, if not all mufflers on the market today. I just want to know if anyone else has experienced the same problem.
My engine combo is 1776cc, with dual 40 dells, w130 cam, ported and polished heads stock valve size.

In my opinion, that cam is way mismatched for those heads...

I know that the cam is "way" big for the motor size and heads, but it is my dad's build from the 80's. I just left it the way it was. It drives fine and all. But the stock size valves combined with the high overlap/duration of the cam make the engine good down low, while still keeping the high end. I think my engine "combo" is really good all around.
I might just splurge and get a Bugpack or Lowbugget. But I'm not sure.

How does the Bugpack "fit" compared to the Empi.

I want to post some pictures of some problem areas that I am concerned with regarding my header. It runs fine, but allows some leakage through the slip joint.

Thu Oct 20, 2011 6:47 pm

Thanks for the heads up guys. i was going to buy empi but ill go bugpack now :lol:

Thu Oct 20, 2011 11:05 pm

I have a CB 1.5" merged header with a single glasspack muffler that i've had forever, its got a motor sound rather than an exhaust sound, my single quietpack was the same. Even though they aren't really made for a merged header, they do the job.

Fri Oct 21, 2011 12:25 pm

ive seen a lot of mufflers that are way to big for these motors,my merged header has a 2"outlet witch is about right and the muffler is also 2" the 3" ones are for the guys that want to look bad.just like the 3"systems on the yingyangs.2-2 1/4 max size if you want to keep power&torque,try magnaflow,flowmaster and they even have stainless and the knock off companys also have stainless,and yes some of the klnock off are made in the usa.to big of a tube & muffler lets the exhaust "stack up"&jumble around, instead of staying inline and getting the eff out of the way.(and yes it has been proven, I would imanguine ray would know something about the effect of the pulses in a tube that is to big)