Semi-Truck & Busses Application

Spiral Turbo Specialties has developed an exhaust baffle system for the semi-truck, bus, and heavy duty vehicle industry. This system not only significantly reduces noise levels, increase horse-power and torque, BUT also improves fuel economy by 3%-8% (depending on driver, geographic area, and all the other varialbles concerned with obtaining better fuel economy).

Main Improvements:

1. dB levels are within 1-2 dB's of stock OEM mufflers (80-82 dB's)
2. Horsepower and torque increases, but vary for different models. They are higher in stock levels.
3. Pyrometer temperatures have dropped 50-100°. COOLER TEMPERATURES MEANS BETTER MILEAGE.
4. Turbo chargers spool up quicker. Quicker spooling also means better EFFICIENCY.
5. STRAIGHT STACK LOOK...without the noise or the tickets! The STS Baffles fit "INSIDE" the stacks.
6. Mileage up 3%-8% on average.
7. ALL Steel construction, 14 gauge Aluminized.
8. LESS RESTRICTION means everything runs better.
9. Idles better.

Your test results may vary according to conditions, engine set-ups, geographical area, etc. Many state patrol agencies across the USA are familiar with the STS Baffles, and how they control dB levels. Jake Brake levels remain the same or slightly higher though. 6.0" STS Baffles have a general dB level of 81. These tests for dB levels were done with a loaded trailer, and the tractor was an N14 Cummins. The STS Baffles BOLT in so there is NO Rattling.

Available now is part no. STS6.022545A14 for the 6" stacks.

Available Soon...STS 8.0" incased baffle (5.0" in and 5.0" out) for above 15L and 400 HP motors (dual baffles only).

Total lenth for the 8.0" will be a stock 51.0" length. Adapters with the kit to make the install direct bolt on, and will work with your shield.
Call for 8.0" availability.

Questions call STS at 330.321.1918

*Available soon. Call for info.
**Dual Application-dual baffles shipped bound together. Includes shipping and handling in continental USA.

For immediate shipping: Cashiers check or postal money orders accepted.

We also accept personal checks. Allow 7-10 days for checks to clear.