Looking For A Head Turning Hot Rod Sound With Improved Performance From Your Present Exhaust System?

OUR ORIGINAL THUNDER MONSTER BAFFLES - deliver a deeper tone to the note of your exhaust. Additionally, Thunder Monster baffles will turn all the horsepower loose. Up to 12 midrange HP over a straight pipe with no baffle, enough torque to pull tree stumps, and a killer sound. These fit: 1 5/8" INSIDE DIAMETER PIPES, 1 3/4" INSIDE DIAMETER PIPES, 1 7/8" INSIDE DIAMETER PIPES, 2" INSIDE DIAMETER PIPES, & 2 1/8" INSIDE DIAMETER PIPES.

$79.95 per pair + S&H*

It's what's inside Thunder Monster Baffles that counts!

How Do I Know If Thunder Monster Baffles Will Fit My Pipes?

Big City Thunder products work in any 4 cycle engine with a straight pipe type exhaust
from a single cylinder up to 6 cylinder motorcycles with any cubic inch displacement. Installation instructions are included with all our products.

If you have Vance & Hines, Screamin' Eagle, Bub, Cobra, Samson, Rinehart, Jardine, Bassini, Custom Built, or other aftermarket pipe that at the exit end does not turn out (does not include tips that can be removed), and is of a straight type pipe design that measures
1 5/8", 1 3/4", 1 7/8", 2" or 2 1/8" inside diameter, Thunder Monster baffles will fit your pipe.

For curved pipes such as Vance & Hines Big Radius and Ness Slashers we recommend our Thunder Monster baffles part number 2002. For the Hooker Troublemakers we recommend our Thunder Monster baffles part number 2001. For other curved pipe applications please call and have the pipe dimensions available.

THUNDER MONSTER BAFFLES FOR LARGE DIAMETER MUFFLERS, 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 Thunder Monster baffles that install 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 with our Original Thunder Monster baffles will provide a deeper, throatier, aggressive hot rod/hot bike sound as well as improved performance or for a more subtle hot rod rumble our QQ Series Thunder Monster baffles will do the trick. 
Original Thunder Monster baffles $79.95 per pair + S&H*
QQ Series Thunder Monster baffles $129.95 per pair + S&H*

Click on image for larger view

ALL Thunder Monster baffles are compatible with fuel injection! 

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

DUE TO THE FACT THAT PIPES AND STYLES WILL VARY EVEN WITH THE SAME MANUFACTURER PLEASE BE SURE TO MEASURE THE INSIDE AND OUTSIDE DIAMETER OF YOUR PIPES AS WELL AS THE OUTSIDE DIAMETER OF YOUR BAFFLE, PROVIDED YOU HAVE ONE, BEFORE CALLING OR E-MAILING; WE NEED THAT INFORMATION IN ORDER TO PROVIDE YOU WITH THE CORRECT PRODUCT.

Questions? ask us at questions@bigcitythunder.com!