[118 Pair]

[158 Single]

[258 Pair]

[158 Pair]

[118 Single]

Choose the Correct Size TTI by Messuring the inside diameter of your exhaust. Select your TTI by the following -FITMENT NOTES: 1.5"-2" inside diameter -you will need TTI-118, 2-3" inside diameter - you will need TTI-158, and if you have 3"+ inside diameter -you will need the TTI-258. When ordering you have an option of getting just ONE (single) TTI if you have a 2-1 exhaust system that has only One slip-on, or to choose TWO TTIs (pair) for exhausts that have Two Slip-ons.Without getting too technical, weve spent thousands of hours testing shape, size, thickness, & surface coatings to find the optimum combination that increases power across a wide RPM band, AND gives maximun flexibility to deliver different sounds. Thunder Torque Inserts are designed to perform well when used on slip-ons with and without baffles, drag pipes, shortys and 2-1 Systems. The Patented design will produce a bit deeper sound/rumble all the way through the RPM and Throttle range. If you feel that your current exhaust is too loud, the Thunder Torque Inserts will noticeably reduce the decible levels. The Increase in Torque is accomplished by reducing engine pumping losses, increasing exhaust gas velocity and increasing inertial scavenging.