THUNDER MONSTER BAFFLES FOR SCREAMIN' EAGLE II SLIP FIT MUFFLERS - WITH A REMOVABLE BAFFLE THAT THE SCREAMIN' EAGLE BAFFLE MEASUREMENT IS: 2 7/8" DIA. x 11 1/4" LONG. (Note: one of the mufflers must have “Screamin’ Eagle II” stamped on it for these baffles to be compatible.
They will not fit the ’07 and later Screamin’ Eagle mufflers.) Turn your Screamin’ Eagle II mufflers into a completely new exhaust system in minutes and have a deeper, throatier tone to the exhaust note with our easy to install Thunder Monster replacement baffles. Slide out the old, slide in the new, no cutting, welding drilling or hassles. It’s that easy.

$129.95 per pair + S&H*

For ' 07 & Newer Screamin' Eagle® Street Performance Slip On Mufflers

Supercharge your Sound and Performance with our New Dyno Proven QQ Thunder Monster baffles for Screamin’ Eagle Street Performance mufflers. You can turn your Screamin’ Eagle Street Performance Sip On Mufflers into a completely new exhaust system with a hot new sound. The QQ Thunder Monster baffles deliver a deeper, throatier tone that is not as loud as our Original Thunder Monster baffles but still has our famous sought after hot rod rumble.  Want it louder?  We do have our Original Thunder Monster Baffles available for the Street Performance Slip On Mufflers as well.  (You can order the QQ Series Thunder Monster Baffles for ’07 and newer Screamin’ Eagle Street Performance Slip On Mufflers on line.  However for the Original Thunder Monster baffles for the ’07 and newer Screamin’ Eagle Street Performance Mufflers it will be necessary to call.)

$169.95 per pair + S&H*

For Softail models – If your Screamin’ Eagle Street Performance Slip On Muffler baffle measures 3 1/8” diameter by approximately 17 ¾” in length our new QQ Thunder Monster baffles are designed to replace the original Screamin’ Eagle® Street Performance Slip On Muffler baffles and deliver a deeper, throatier, hot rod sound as well as improved performance.  If you want more volume we have our Original Thunder Monster baffles available also.  Please measure per the illustration shown prior to calling, e-mailing or ordering.

Your Screamin’ Eagle Street Performance Sip On Muffler Baffle must match the illustration shown below, dimensionally and look the same.

For Bagger models – If your Screamin’ Eagle Street Performance Slip On Muffler baffle measures 3 3/8” diameter by approximately 26 ¼” in length our New QQ Thunder Monster baffles are designed to replace the original Screamin’ Eagle Street Performance Slip On Muffler baffles and deliver a deeper, throatier, hot rod sound as well as improved performance. Want more volume?  We have our Original Thunder Monster baffles for this application as well.  Please measure per the illustration shown below prior to calling, e-mailing or ordering. (These baffles are not compatible with the 4” Touring Mufflers.)

Your Screamin’ Eagle baffle must match the illustration shown below, dimensionally and look the same.

Cutaway picture of our new Thunder Monster baffle for Screamin’ Eagle Street Performance Slip On Mufflers shown to the right.

QUIET NEVER SOUNDED THIS HOT!!

Screamin' Eagle Pro 16 Guage Double Shotgun Exhaust System

For the Screamin’ Eagle Pro 16 Gauge Double Barrel Exhaust system we have available both our Original Thunder Monster baffles part number 2001 for our Original hot rod sound or our new QQ Series Thunder Monster baffles part number QBL 1994 for a more subtle hot rod rumble. 

Original Thunder Monster baffles are $79.95 per pair + S&H.*

QQ Thunder Monster baffles are
$129.95 per pair + S&H.*

THUNDER MONSTER BAFFLES FOR LARGE DIAMETER MUFFLERS, ie. If you have installed aftermarket mufflers or you have “gutted” your stock mufflers, drilled them out, removed or modified the baffles, have a free flowing type baffle, or have an application in which you are not able to install the Thunder Monster baffles in the rear portion of the pipe, Big City Thunder has a Thunder Monster baffle that installs in the exit end of the head pipe where it joins the muffler.  As with all our other products the Thunder Monster baffles will provide the proper amount of back pressure, flow the exhaust gases properly and act as a superior anti-reversion device.  This particular application is called a head pipe installation and will provide a deeper, throatier, hot rod/hot bike sound as well as improved performance.
$79.95 per pair + S&H*

ALL Thunder Monster baffles are compatible with fuel injection! 

* All prices subject to change with out prior written notice.